Part A
Some questions in Part A require that you access data from
Statistics for People Who (Think
T
hey) Hate Statistics
.
This data is available on the student website under the Student Test Resources link.
1.
By hand, compute the mean, median, and mode for the following set of 40 reading scores:
SUMMARY
31
32
43
42
24
34
25
44
23
43
24
36
25
41
23
28
14
21
24
17
25
23
44
21
13
26
23
32
12
26
14
42
14
31
52
12
23
42
32
34
2.
Compute the means for the following set of scores saved as Ch. 2 Data Set 3 using IBM
®
SPSS
®
software. Print out a copy of the output.
Hospital size (number of beds)
Infection rate (per 1,000 admissions)
234
1.7
214
2.4
165
3.1
436
5.6
432
4.9
342
5.3
276
5.6
187
1.2
512
3.3
553
4.1
3.
You are the manager of a fast food store. Part of your job is to report which special is selling best to the boss at the end of each day. Use your knowledge of descriptive statistics and write one paragraph to let the boss know what happened today. Use the following data. Do not use IBM
®
SPSS
®
software to compute the statistics needed; rather, do it by hand. Include a copy of your work.
Special number
Sold
Cost
Huge Burger
20
$2.95
Baby Burger
18
$1.49
Chicken Littles
25
$3.50
Porker Burger
19
$2.95
Yummy Burger
17
$1.99
Coney Dog
20
$1.99
Total specials sold
119
4.
Suppose you are working with a data set that has some different (much larger or much smaller than the rest of the data) scores. What measure of central tendency would you use and why?
5.
For the following set of scores, compute the range, the unbiased and the biased standard deviations, and the variance. Do the exercise by hand.
31, 42, 35, 55, 54, 34, 25, 44, 35
Why is the unbiased estimate greater than the biased estimate?
6.
Use IBM
®
SPSS
®
software to compute all the descriptive statistics for the following set of three test scores over the course of a semester. Which test had the highest average score? Which test had the smallest amount of variability?
Test 1
Test 2
Test 3
50
50
49
48
49
47
51
51
51
46
46
55
49
48
55
48
53
45
49
49
47
49
52
45
50
48
46
50
55
53
7.
This practice problem uses the data contained in the file named Ch. 3 Data Set 3. There are two variables in this data set.
Variable
Definition
Height
Height in inches
Weight
Weight in pounds
Using IBM
®
SPSS
®
software, compute all of the measures of variability you can for height and weight.
8.
Review the following frequency distribution. Create a histogram either by hand or by using some other application such as a Microsoft
®
Excel
®
document.
Class interval
Frequency
90–100
12
80–89
14
70–79
20
60–69
24
50–59
28
40–49
29
30–39
21
20–29
15
10–19
17
0–9
12
9.
A third-grade teacher is looking to improve her students’ level of engagement during group discussions and instruction. She keeps track of each of the 15 third graders’ number of responses every day for 1 week. This information is available in Ch. 4 Data Set 2. Use IBM
®
SPSS
®
software to create a bar chart (one bar .
Organic Name Reactions for the students and aspirants of Chemistry12th.pptx
Part ASome questions in Part A require that you access data from.docx
1. Part A
Some questions in Part A require that you access data from
Statistics for People Who (Think
T
hey) Hate Statistics
.
This data is available on the student website under the Student
Test Resources link.
1.
By hand, compute the mean, median, and mode for the
following set of 40 reading scores:
SUMMARY
31
32
43
42
24
34
25
44
23
43
24
36
25
41
23
28
14
21
24
17
3. 165
3.1
436
5.6
432
4.9
342
5.3
276
5.6
187
1.2
512
3.3
553
4.1
3.
You are the manager of a fast food store. Part of your job is to
report which special is selling best to the boss at the end of
each day. Use your knowledge of descriptive statistics and write
one paragraph to let the boss know what happened today. Use
the following data. Do not use IBM
®
SPSS
®
software to compute the statistics needed; rather, do it by hand.
Include a copy of your work.
Special number
Sold
Cost
Huge Burger
20
$2.95
4. Baby Burger
18
$1.49
Chicken Littles
25
$3.50
Porker Burger
19
$2.95
Yummy Burger
17
$1.99
Coney Dog
20
$1.99
Total specials sold
119
4.
Suppose you are working with a data set that has some different
(much larger or much smaller than the rest of the data) scores.
What measure of central tendency would you use and why?
5.
For the following set of scores, compute the range, the unbiased
and the biased standard deviations, and the variance. Do the
exercise by hand.
31, 42, 35, 55, 54, 34, 25, 44, 35
Why is the unbiased estimate greater than the biased estimate?
6.
5. Use IBM
®
SPSS
®
software to compute all the descriptive statistics for the
following set of three test scores over the course of a semester.
Which test had the highest average score? Which test had the
smallest amount of variability?
Test 1
Test 2
Test 3
50
50
49
48
49
47
51
51
51
46
46
55
49
48
55
48
53
45
49
49
47
49
52
6. 45
50
48
46
50
55
53
7.
This practice problem uses the data contained in the file named
Ch. 3 Data Set 3. There are two variables in this data set.
Variable
Definition
Height
Height in inches
Weight
Weight in pounds
Using IBM
®
SPSS
®
software, compute all of the measures of variability you can for
height and weight.
8.
Review the following frequency distribution. Create a histogram
either by hand or by using some other application such as a
Microsoft
®
Excel
®
document.
8. 10.
Identify whether these distributions are negatively skewed,
positively skewed, or not skewed at all, and why.
a.
This talented group of athletes scored very high on the vertical
jump task.
b.
On this incredibly crummy test, everyone received the same
score.
c.
On the most difficult spelling test of the year, the third graders
wept as the scores were delivered.
11.
For each of the following, indicate whether you would use a pie,
line, or bar chart, and why.
a.
The proportion of freshmen, sophomores, juniors, and seniors in
a particular university
b.
Change in GPA over four semesters
c.
Number of applicants for four different jobs
d.
Reaction time to different stimuli