The document describes a final exam for an economics course with 4 parts:
- Part A contains 20 true/false questions
- Part B contains 40 multiple choice questions
- Part C contains 5 work problems where steps must be shown
- The exam must be submitted by December 7, 2015 at noon in a scanned file or Word document. Excel files are not acceptable.
Simple Regression presentation is a
partial fulfillment to the requirement in PA 297 Research for Public Administrators, presented by Atty. Gayam , Dr. Cabling and Mr. Cagampang
Simple Regression presentation is a
partial fulfillment to the requirement in PA 297 Research for Public Administrators, presented by Atty. Gayam , Dr. Cabling and Mr. Cagampang
This 10 hours class is intended to give students the basis to empirically solve statistical problems. Talk 1 serves as an introduction to the statistical software R, and presents how to calculate basic measures such as mean, variance, correlation and gini index. Talk 2 shows how the central limit theorem and the law of the large numbers work empirically. Talk 3 presents the point estimate, the confidence interval and the hypothesis test for the most important parameters. Talk 4 introduces to the linear regression model and Talk 5 to the bootstrap world. Talk 5 also presents an easy example of a markov chains.
All the talks are supported by script codes, in R language.
Regression Analysis is simplified in this presentation. Starting with simple linear to multiple regression analysis, it covers all the statistics and interpretation of various diagnostic plots. Besides, how to verify regression assumptions and some advance concepts of choosing best models makes the slides more useful SAS program codes of two examples are also included.
It introduces the reader to the basic concepts behind regression - a key advanced analytics theory. It describes simple and multiple linear regression in detail. It also talks about some limitations of linear regression as well. Logistic regression is just touched upon, but not delved deeper into this presentation.
Study of Mobile Phone Gratification Sought and Obtained by Aquaculture Farmer...IJEAB
Mobile phone is strategic in the current effort to improve advisory services delivery and effectiveness of information sharing toenhance aquaculture entrepreneurship for food security, and wealth creation in the country. This prompted the study of mobile phone gratification sought and obtained among table size aquaculture fish food producers through the application of Uses and Gratification Theory. In pursuit of the set objectives, primary data was generated from 100 respondents in Niger State, Nigeria which was analysed with descriptive and inferential statistic tools. Personal profile revealed dominance of aquapreneur by people in middle age categories with mean age of 42 years and 4.5year of experience. Respondents top gratifications sought from mobile phone usage were to be accessible, connected, job accomplishment and socialization whereas obtained gratifications in enterprise were to support adoption of technologies, timely information, linkage to customers, quick response, and access to inputs. It was revealed that respondents had positive antecedent to mobile phone services subscription relating to caller tone, music, news alert, sports, and health. Socio-economic variables that correlate with gratification sought and obtained were marital status, religion, and education at 0.05 level. In view of the finding on responsible usage of mobile phone in aquaculture enterprise, more investment is required develop mobile phone applications and services. To sustain and improve on the benefits derived, respondents need capacity building to acquire more knowledge and skills to effectively participate in advisory services.
This 10 hours class is intended to give students the basis to empirically solve statistical problems. Talk 1 serves as an introduction to the statistical software R, and presents how to calculate basic measures such as mean, variance, correlation and gini index. Talk 2 shows how the central limit theorem and the law of the large numbers work empirically. Talk 3 presents the point estimate, the confidence interval and the hypothesis test for the most important parameters. Talk 4 introduces to the linear regression model and Talk 5 to the bootstrap world. Talk 5 also presents an easy example of a markov chains.
All the talks are supported by script codes, in R language.
Regression Analysis is simplified in this presentation. Starting with simple linear to multiple regression analysis, it covers all the statistics and interpretation of various diagnostic plots. Besides, how to verify regression assumptions and some advance concepts of choosing best models makes the slides more useful SAS program codes of two examples are also included.
It introduces the reader to the basic concepts behind regression - a key advanced analytics theory. It describes simple and multiple linear regression in detail. It also talks about some limitations of linear regression as well. Logistic regression is just touched upon, but not delved deeper into this presentation.
Study of Mobile Phone Gratification Sought and Obtained by Aquaculture Farmer...IJEAB
Mobile phone is strategic in the current effort to improve advisory services delivery and effectiveness of information sharing toenhance aquaculture entrepreneurship for food security, and wealth creation in the country. This prompted the study of mobile phone gratification sought and obtained among table size aquaculture fish food producers through the application of Uses and Gratification Theory. In pursuit of the set objectives, primary data was generated from 100 respondents in Niger State, Nigeria which was analysed with descriptive and inferential statistic tools. Personal profile revealed dominance of aquapreneur by people in middle age categories with mean age of 42 years and 4.5year of experience. Respondents top gratifications sought from mobile phone usage were to be accessible, connected, job accomplishment and socialization whereas obtained gratifications in enterprise were to support adoption of technologies, timely information, linkage to customers, quick response, and access to inputs. It was revealed that respondents had positive antecedent to mobile phone services subscription relating to caller tone, music, news alert, sports, and health. Socio-economic variables that correlate with gratification sought and obtained were marital status, religion, and education at 0.05 level. In view of the finding on responsible usage of mobile phone in aquaculture enterprise, more investment is required develop mobile phone applications and services. To sustain and improve on the benefits derived, respondents need capacity building to acquire more knowledge and skills to effectively participate in advisory services.
Page 1 of 18Part A Multiple Choice (1–11)______1. Using.docxalfred4lewis58146
Page 1 of 18
Part A: Multiple Choice (1–11)
______1. Using the “eyeball” method, the regression line = 2+2x has been fitted to the data points (x = 2, y = 1), (x = 3, y = 8), and (x = 4, y = 7). The sum of the squared residuals will be
a. 7 b. 19 c. 34 d. 8
______2. A computer statistical package has included the following quantities in its output: SST = 50, SSR = 35, and SSE = 15. How much of the variation in y is explained by the regression equation?
a. 49% b. 70% c. 35% d. 15%
______3. In testing the significance of b, the null hypothesis is generally that
a. β = b b. β 0 c. β = 0 d. β = r
______4. Testing whether the slope of the population regression line could be zero is equivalent to testing whether the population _____________ could be zero.
a. standard error of estimate c. y-intercept
b. prediction interval d. coefficient of correlation
______5. A multiple regression equation includes 4 independent variables, and the coefficient of multiple determination is 0.64. How much of the variation in y is explained by the regression equation?
a. 80% b. 16% c. 32% d. 64%
______6. A multiple regression analysis results in the following values for the sum-of-squares terms: SST = 50.0, SSR = 35.0, and SSE = 15.0. The coefficient of multiple determination will be
a. = 0.35 b. = 0.30 c. = 0.70 d. = 0.50
______7. In testing the overall significance of a multiple regression equation in which there are three independent variables, the null hypothesis is
a. :
b. :
c. :
d. :
______8. In a multiple regression analysis involving 25 data points and 4 independent variables, the sum-of-squares terms are calculated as SSR = 120, SSE = 80, and SST = 200. In testing the overall significance of the regression equation, the calculated value of the test statistic will be
a. F = 1.5 c. F = 5.5
b. F = 2.5 d. F = 7.5
______9. For a set of 15 data points, a computer statistical package has found the multiple regression equation to be = -23 + 20+ 5 + 25 and has listed the t-ratio for testing the significance of each partial regression coefficient. Using the 0.05 level in testing whether = 20 differs significantly from zero, the critical t values will be
a. t = -1.960 and t= +1.960
b. t = -2.132 and t = +2.132
c. t = -2.201 and t = +2.201
d. t = -1.796 and t = +1.796
______10. Computer analyses typically provide a p-Value for each partial regression coefficient. In the case of , this is the probability that
a. = 0
b. =
c. the absolute value of could be this large if = 0
d. the absolute value of could be this large if 1
______11. In the multiple regression equation, = 20,000 + 0.05+ 4500 , is the estimated household income, is the amount of life insurance held by the head of the household, and is a dummy variable ( = 1 if the family owns mutual funds, 0 if it doesn’t). The interpretation of = 4500 is that
a. owing mutual funds increases the estimated income by $4500
b. the average value of a mut.
Fill in the blanks8.1. The magnitude of the correlation .docxmglenn3
Fill in the blanks:
8.1. The magnitude of the correlation is indicated by the correlation _____ which can range from -1.00 to +1.00.
8.2. The most common and efficient way to present the correlations of several variables with each other is by using a(n) ______ table.
8.3. The correlation between two variables can be shown
graphically
by a ________.
8.4.
The null hypothesis predicts that the correlation coefficient is equal to _______.
8.5.
The Spearman rank order correlation is used when the variables to be correlated are measured on a(n) ______ scale.
Circle the
correct
answer:
8.6. The hypothesis that states that
r
¹
0 is an example of a(n)
alternative
/
null
hypothesis.
8.7. When an
increase
in one variable is associated with a
decrease
in the other variable, the correlation between these two variables is
positive/negative
.
8.8. In order to use the Pearson product-moment correlation, the variables to be correlated should be measured on an
ordinal/interval
scale.
8.9. When the points on a scattergram go from the bottom left to the top right they represent a
positive/negative
correlation.
8.10.
The true correlation between two variables may be
underestimated
when the variance of one of the variables is
very high/very low
.
8.11.
When the null hypothesis is rejected at
p
<.001, it means that the chance that
r
=0 is
very small/very high
.
8.12.
The null hypothesis is rejected when the
obtained
correlation coefficient is
higher/lower
than the
critical
value.
Answer/compute the following questions:
8.13 Which correlation coefficient (
a
or
b
) shows a stronger relationship between the two variables being correlated?
a. X
1
&Y
1
:
r
= .85
b. X
2
&Y
2
:
r
= -.94
8.14. Following are two scattergrams (in Figure A and in Figure B). Four different correlation coefficients are listed under each scattergram. Choose the coefficient that best matches each scattergram.
Y Y
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
·
X
X
Figure A
Figure B
A1.
r
= .50 B1.
r
= -.57
A2.
r
= .78 B2.
r
= .92
A3.
r
= -.10 B3.
r
= .38
A4.
r
= -.89 B4.
r
= -.91
8.15 Following is a scattergram showing the scores of 8 statistics students on two tests,
X
and
Y
. Each of the first 7 students is represented by a dot and their scores are listed in the table that follows. Use the scattergram to find the scores of student #8 on test
X
and test
Y
. The location of this student on the scat.
1 of 11UMGC College Algebra MATH 107 6980 - Fall 2020 – Instruct.docxteresehearn
1 of 11
UMGC College Algebra MATH 107 6980 - Fall 2020 – Instructor: Timothy J. Elsner
Page 1 of 11
MATH 107 FINAL EXAMINATION - Nov 15, 2020 - Due Tue Nov 17 11:59 pm
This is an open-book exam. You may refer to your text and other course materials as you work on the exam, and you may
use a calculator. You must complete the exam individually. Neither collaboration nor consultation with others is allowed.
MAKE CERTAIN YOUR SUBMITTAL IS CLEARLY READABLE. FOR THE SHORT ANSWER SECTIONS make sure your ANSWER IS CIRCLED
There are 30 problems. Problems #1–12 are Multiple Choice.
Problems #13–21 are Short Answer. (Work not required to be shown)
Problems #22–30 are Short Answer with work required to be shown. Also read:
Mathematics in Montessori
MULTIPLE CHOICE
1. Determine the domain and range of the piecewise function. 1._______
A. Domain [ -5, 5]; Range [- 6, 6]
B. Domain [- 4, 5]; Range [- 6, 6]
C. Domain [- 6, 5]; Range [- 4, 6]
D. Domain [- 6, 6]; Range [- 4, 5]
2. Solve: x = √−8x + 9 and check your solution(s) 2.________
A. x = - 9
B. x = 1
C. x = {-9, 1}
D. No
Solution
2 of 11
3. Determine the x interval(s) on which the function is increasing. 3.__________
A. (−4, 0] and [4, ∞)
B. [0, 4]
C. (−∞, 3) ∪ [−1, 5 ]
D. (−∞, −4] and [0, 4 ]
4. Determine whether the graph of Y = | x | - 3 is symmetric with respect 4. _________
to the origin, the x-axis, or the y-axis.
A. symmetric with respect to the x-axis only
B. symmetric with respect to the y-axis only
C. symmetric with respect to the origin only
D. not symmetric with respect to the x-axis, not symmetric with respect to the y-axis,
and not symmetric with respect to the origin
5. Find the solution to the inequality : | 6 – x | + 3 < 8 5. ___________
A. (????, ∞)
B. (???? , ???????? )
C. (−∞, ????) ∪ (????????, ∞)
D. (−1, −????????)
3 of 11
6. Which of the following represents the graph of −3x + 5y = 15 ? __________
A. B.
C. D.
7. Write a slope-intercept equation for a line perpendicular to the line −3x + 5y = 15
which passes through the point (6, – 5).
A. y = − ????
???? ???? + ????
B. y = ????
???? ???? − ????????
C. y = − ????
???? ???? + ????
D. y = ????
???? ???? − ????????
4 of 11
8. Choose what type of graph is below ? 8.___________
A. It is not a function.
B. It is a function and it is one-to-one.
C. It is a function but it is not one-to-one.
D. It is not a function and it is not one-to-one.
9. Express as a single logarithm: log (2x + 1) + log 2x - 4 log x 9.__________
A. log ( 4x+1
4x )
B. log ( 2x(2x+1)
4x )
C. log ( 4x2 - 2x)
D. log ( 2???? (2???? + 1)
????4 )
10. Which of the functions correspond to the graph? 10.__________
A. f(x) = e x
B. f(x) = e x – 1
C. f(x) = log(x)
D. f(x) = log(x) – 1
5 of 11
11. Suppose that for a function f(x), that it has exactly 1 zero (or 1 X-intercept)
Which of the following statements MUST true? (only one answer is correct) 11. _________
A. f(x) is linear and has a positive slope.
B.
2137ad Merindol Colony Interiors where refugee try to build a seemengly norm...luforfor
This are the interiors of the Merindol Colony in 2137ad after the Climate Change Collapse and the Apocalipse Wars. Merindol is a small Colony in the Italian Alps where there are around 4000 humans. The Colony values mainly around meritocracy and selection by effort.
Explore the multifaceted world of Muntadher Saleh, an Iraqi polymath renowned for his expertise in visual art, writing, design, and pharmacy. This SlideShare delves into his innovative contributions across various disciplines, showcasing his unique ability to blend traditional themes with modern aesthetics. Learn about his impactful artworks, thought-provoking literary pieces, and his vision as a Neo-Pop artist dedicated to raising awareness about Iraq's cultural heritage. Discover why Muntadher Saleh is celebrated as "The Last Polymath" and how his multidisciplinary talents continue to inspire and influence.
Hadj Ounis's most notable work is his sculpture titled "Metamorphosis." This piece showcases Ounis's mastery of form and texture, as he seamlessly combines metal and wood to create a dynamic and visually striking composition. The juxtaposition of the two materials creates a sense of tension and harmony, inviting viewers to contemplate the relationship between nature and industry.
2137ad - Characters that live in Merindol and are at the center of main storiesluforfor
Kurgan is a russian expatriate that is secretly in love with Sonia Contado. Henry is a british soldier that took refuge in Merindol Colony in 2137ad. He is the lover of Sonia Contado.
2137ad - Characters that live in Merindol and are at the center of main stories
ECO 578 Final Exam There are 4 parts
1. Buy here:
http://student.land/eco-578-final-exam-there-are-4-parts/
ECO 578
Final Exam There are 4 parts:
Part A: True/ False (1-20)
Part B: Select the correct answer for the following questions (21-40)
Part C: Work Problem (41-52) **All work in part C must be shown step by step** Two
different ways to submit your answer sheet
1. Scan your answer sheet and place it in ONE FILE at drop-box. (preferable)
2. Use MS-Word and place it in a drop-box. **Excel is not acceptable for this test
**Deadline: Monday, December 7, 2015 by noon (CST) **All work in part C must be
shown step by step in order to receive credit Part A: True/ False (1-20)
_______ 1. The usual objective of regression analysis is to predict estimate the value
of one variable
when the value of another variable is known.
_______ 2. Correlation analysis is concerned with measuring the strength of the
relationship between
two variables.
2. _______ 3. The term ei in the simple linear regression model indicates the amount of
change in Y for a
unit change in X.
_______ 4. In the sample regression equation y = a + bx, b is the slope of the
regression line.
_______ 5. The coefficient of determination can assume any value between -1 and +1.
_______ 6. In the least squares model, the explained sum of squares is always smaller
than the
regression sum of squares.
_______ 7. The sample correlation coefficient and the sample slope will always have
the same sign.
_______ 8. Given the sample regression equation y = -3 + 5x, we know that in the
sample X and Y are
inversely related.
_______ 9. Given the sample regression equation y = 5 – 6x, we know that when X = 2,
Y = 17. ECO 578 Fall 2015
Page 2 of 14 _______ 10. An important relationship in regression analysis is =
(Yi Y ) ˆ
ˆ
3. (Y Y ) (Yi Y ) . _______ 11. Regression analysis is concerned with the form of the
relationship among variables,
whereas correlation analysis is conc erned with the strength of the relationship.
_______ 12. The correlation coefficient indicates the amount of change in Y when X
change by one unit.
_______ 13. In simple linear regression analysis, when the slope is equal to zero, the
independent
variable does not explain any of the variability in the dependent variable.
_______ 14. One of the purposes of regression analysis is to estimate a mean of the
independent
variable for given values of the dependent variable.
_______ 15. The variable that can be manipulated by the investigator is called the
independent variable.
_______ 16. When b = 0, X and Y are not related.
_______ 17. If zero is contained in the 95% confidence interval for b, we may reject H
o: b = 0 at the 0.05
level of significance.
_______ 18. If in a regression analysis the explained sum of squares is 75 and the
unexplained sum of
square is 25, r2 = 0.33.
4. _______ 19. In general, the smaller the dispersion of observed points about a fitted
regression line, the
larger the value of the coefficient of determination.
_______ 20. When small values of Y tend to be paired with small values of X, the
relationship between X
and Y is said to be inverse. Part B: Select the correct answer for the following
questions (21
– 40)
_______ 21. The variable about which the investigator wishes to make predictions or
estimates is called
the
a. dependent variable
b. unit of association
c. independent variable
d. discrete variable
_______ 22. In regression analysis, the quantity that gives the amount by which Y
changes for a unit
change in X is called the
a. coefficient of determination
5. b. slope of the regression line
c. Y intercept of the regression line
d. correlation coefficient
_______ 23. In the equation y = b0 +b1 (x), b0 is the
a. coefficient of determination
b. slope of the regression line
c. y intercept of the regression line
d. correlation coefficient ECO 578 Fall 2015
Page 3 of 14 _______ 24. In the equation y = b0 + b1 (x), b1 is the
a. coefficient of determination
b. slope of the regression line
c. y intercept of the regression line
d. correlation coefficient
_______ 25. In regression and correlation analysis, the measure whose values are
restricted to the range
0 to 1, inclusive, is the
a. coefficient of determination
b. slope of the regression line
6. c. y intercept of the regression line
d. correlation coefficient
_______ 26. In regression and correlation analysis, the measure whose values are
restricted to the range
-1 to +1, inclusive, is the
a. coefficient of determination
b. slope of the regression line
c. y intercept of the regression line
d. correlation coefficient
_______ 27. The quantity ˆ
(Yi Y ) 2 is called the _______________ sum of square. a. least
c. total
_______ 28. If, in the regression model,
between X and Y.
a. an inverse
c. a direct b. explained
d. unexplained b1 = 0, we say there is _____________ linear relationship
b. a significant
7. d. no _______ 29. If, in the regression model, b is negative, we say there is
_____________ linear relationship
between X and Y.
a. an inverse
b. a significant
c. a direct
d. no
_______ 30. The _______________ sum of square is a measure of the total variability
in the observed
values of Y that is accounted for by the linear relationship between the observed
values of X and Y.
a. unexplained
b. total
c. error
d. explained
_______ 31. If two variables are not related, we know that ________________.
a. their correlation coefficient is equal to zero.
b. the variability in one of them cannot be explained by the other.
c. the slope of the regression line for the two variables is equal to zero.
8. d. all of the above statements are true.
_______ 32. In simple linear regression analysis, if the correlation coefficient is equal
to 1.0,
______________.
a. the slope is equal to 1.0
b. all the variability in the dependent variable is explained by the independent
variable.
c. the y intercept is equal to 1.0
d. the relationship between the two variables can be described as a bivariable normal
distribution. ECO 578 Fall 2015
Page 4 of 14 _______ 33. The following results were obtained from a simple linear
regression analysis. Total sum of
square = 5.7640. Unexplained sum of square = 0.2225. The coefficient of determination
is ____
a. 0.0402
b. 0.0386
c. 0.9805
d. 0.9614
_______ 34. The following results were obtained as part of a simple linear correlation
analysis: Y = 97.98
9. – 4.33x regression sum of squares = 2680. 27. Error sum of squares = 125.40. Total
sum of squares =
2805.67. The sample correlation coefficient is ____
a. -0.9774
b. 0.9553
c. 0.2114
d. 0.0447
________ 35. The following equation describes the relationship between output and
labor input at a
sample of work stations in a manufacturing plant: ^
Y =2.35+2.20 X . Suppose, for a selected workstation, the labor input is 5. The
predicted output is _____________.
a. 4.55
b. 2.35
c. 2.20
d. 13.35
_______ 36. In regression and correlation analysis, the entity on which sets of
measurements are taken
is called the ______________.
10. a. dependent variable
b. independent variable
c. variables
d. discrete variable
_______ 37. The quantity ^ ´
∑ (Y −Y )2 a. least
c. explained
_______ 38. If, in the regression model,
relationship between X and Y.
a. an inverse
c. a significant is called the _____________ sum of squares.
b. total
d. unexplained b1 is positive, we say there is ____________ linear
b. a direct
d. no _______ 39. If, as X increase, Y tends to increase, we say there is ____________
linear relationship
between X and Y.
a. an inverse