A study of the eflect of teievilon commerciab on 12 year did children.pdf

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A study of the eflect of teievilon commerciab on 12 year did children measured their ettention span, in seconds. The commercials were for clothes, food, and toys. Biscickere tot the fixcel Dots file Aequired: a. What are the nuli and altemate hypotheses? b. Courplete the AvoVA table. Use 0.05 significance level. (Round the SS and MS values to 1 decimal place, F value, pvalue, and F Filt to 2 decimal places. Leave no cells blank - be certain to enter "o" wherever requited. glound the af values to nearest whole numbec) c. What is the test statibuct (Aound your answer to 4 decimal places) d. What is toe prebie? (Round your anuwer to 4 decimal places) 9. Compute the 95% confidence intervals that estimate the difference between each pair of means. (Negative amount should be indicated by a minus sign. Round your answers to 2 decimal places.) h. Which pairs of means are statistically different? Clothes - Food Clothes - Toys Food - Toys All of the above..

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STAT 200: Introduction to Statistics Final Examination, Spring 2016 OL4 Page 1 of 7 STAT 200 OL4/US2 Sections Final Exam Spring 2016 The final exam will be posted at 12:01 am on May 6, and it is due at 11:59 pm on May 8, 2016. Eastern Time is our reference time. 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. It is a violation of the UMUC Academic Dishonesty and Plagiarism policy to use unauthorized materials or work from others. Answer all 20 questions. Make sure your answers are as complete as possible. Show all of your work and reasoning. In particular, when there are calculations involved, you must show how you come up with your answers with critical work and/or necessary tables. Answers that come straight from calculators, programs or software packages will not be accepted. If you need to use software (for example, Excel) and /or online or hand-held calculators to aid in your calculation, you must cite the sources and explain how you get the results. Record your answers and work on the separate answer sheet provided. This exam has 200 total points; 10 points for each question. You must include the Honor Pledge on the title page of your submitted final exam. Exams submitted without the Honor Pledge will not be accepted. STAT 200: Introduction to Statistics Final Examination, Spring 2016 OL4 Page 2 of 7 1. True or False. Justify for full credit. (a) If P(A) = 0.4 , P(B) = 0.5, and A and B are disjoint, then P(A AND B) = 0.2. (b) If all the observations in a data set are identical, then the variance for this data set is 0. (c) The mean is always equal to the median for a normal distribution. (d) It’s easier to reject the null hypothesis at significance level of 0.01 than at significance level of 0.05. (e) In a two-tailed test, the value of the test statistic is 2. If we know the test statistic follows a Student’s t-distribution with P(T >2) = 0.03, then we have sufficient evidence to reject the null hypothesis at 0.05 level of significance. 2. Identify which of these types of sampling is used: cluster, convenience, simple random, systematic, or stratified. Justify for full credit. (a) The quality control department of a semiconductor manufacturing company tests every 100 th product from the assembly line. (b) UMUC STAT Club wanted to estimate the study hours of STAT 200 students. Two STAT 200 sections were randomly selected and all students from these two sections were asked to fill out the questionnaire. (c) A STAT 200 student is interested in the number of credit cards owned by college students. She surveyed all of her classmates to collect sample data. (d) In a career readiness research, 1.

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Week 5 Homework Homework #1 Ms. Lisa Monnin is the budget director for Nexus Media Inc. She would like to compare the daily travel expenses for the sales staff and the audit staff. She collected the following sample information. Sales ($) 129 137 142 162 137 145 Audit ($) 128 98 128 140 148 110 132 At the 0.1 significance level, can she conclude that the mean daily expenses are greater for the sales staff than the audit staff? (a) State the decision rule. (Round your answer to 3 decimal places.) Reject H0 if t > (b) Compute the pooled estimate of the population variance. (Round your answer to 2 decimal places.) Pooled variance (c) Compute the test statistic. (Round your answer to 3 decimal places.) Value of the test statistic (d) State your decision about the null hypothesis. H0 : μs ≤ μa (e) Estimate the p-value. (Round your answers to 3 decimal places.) p-value Homework #2 Suppose you are an expert on the fashion industry and wish to gather information to compare the amount earned per month by models featuring Liz Claiborne attire with those of Calvin Klein. Assume the population standard deviations are not the same. The following is the amount ($000) earned per month by a sample of Claiborne models: $5.4 $4.3 $3.7 $6.7 $4.9 $5.9 $3.1 $5.2 $4.7 $3.5 5.8 4 3.1 5.6 6.9 The following is the amount ($000) earned by a sample of Klein models. $2.5 $2.6 $3.5 $3.4 $2.8 $3.1 $4 $2.5 $2 $2.9 2.7 2.3 (1) Find the degrees of freedom for unequal variance test. (Round down your answer to the nearest whole number.) Degrees of freedom (2) State the decision rule for 0.01 significance level: H0: μLC ≤ μCK; H1: μLC > μCK. (Round your answer to 3 decimal places.) Reject H0 if t> (3) Compute the value of the test statistic. (Round your answer to 3 decimal places.) Value of the test statistic (4) Is it reasonable to conclude that Claiborne models earn more? Use the 0.01 significance level. H0. It is to conclude that Claiborne models earn more. Homework #3 A recent study focused on the number of times men and women who live alone buy take-out dinner in a month. The information is summarized below. Statistic Men Women Sample mean 23.82 21.38 Population standard deviation 5.91 4.87 Sample size 34 36 At the .01 significance level, is there a difference in the mean number of times men and women order take-out dinners in a month? (a) Compute the value of the test statistic. (Round your answer to 2 decimal places.) Value of the test statistic (b) What is your decision regarding on null hypothesis? The decision is the null hypothesis that the means are the same. (c) What is the p-value? (Round your answer to 4 decimal places.) p-value rev: 04_04_2012, 04_25_2014_QC_48145 Homework #4 Suppose the manufacturer of Advil, a common headache remedy, recently developed a new formulation of the drug that is claimed to be more effective. To evaluate the new drug, a s.

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Please put answers below the boxes 1) A politician claims that he is supported by a clear majority of voters. In a recent survey, 35 out of 51 randomly selected voters indicated that they would vote for the politician. Use a 5% significance level for the test. Use Table 1. a. Select the null and the alternative hypotheses. H0: p = 0.50; HA: p ≠ 0.50 H0: p ≤ 0.50; HA: p > 0.50 H0: p ≥ 0.50; HA: p < 0.50 b. Calculate the sample proportion. (Round your answer to 3 decimal places.) Sample proportion c. Calculate the value of test statistic. (Round intermediate calculations to 4 decimal places. Round your answer to 2 decimal places.) Test statistic d. Calculate the p-value of the test statistic. (Round intermediate calculations to 4 decimal places. Round "z" value to 2 decimal places and final answer to 4 decimal places.) p-value e. What is the conclusion? Do not reject H0; the politician is not supported by a clear majority Do not reject H0; the politician is supported by a clear majority Reject H0; the politician is not supported by a clear majority Reject H0; the politician is supported by a clear majority 2) Consider the following contingency table. B Bc A 22 24 Ac 28 26 a. Convert the contingency table into a joint probability table. (Round your intermediate calculations and final answers to 4 decimal places.) B Bc Total A Ac Total b. What is the probability that A occurs? (Round your intermediate calculations and final answer to 4 decimal places.) Probability c. What is the probability that A and B occur? (Round your intermediate calculations and final answer to 4 decimal places.) Probability d. Given that B has occurred, what is the probability that A occurs? (Round your intermediate calculations and final answer to 4 decimal places.) Probability e. Given that Ac has occurred, what is the probability that B occurs? (Round your intermediate calculations and final answer to 4 decimal places.) Probability f. Are A and B mutually exclusive events? Yes because P(A | B) ≠ P(A). Yes because P(A ∩ B) ≠ 0. No because P(A | B) ≠ P(A). No because P(A ∩ B) ≠ 0. g. Are A and B independent events? Yes because P(A | B) ≠ P(A). Yes because P(A ∩ B) ≠ 0. No because P(A | B) ≠ P(A). No because P(A ∩ B) ≠ 0. 3) A hair salon in Cambridge, Massachusetts, reports that on seven randomly selected weekdays, the number of customers who visited the salon were 72, 55, 49, 35, 39, 23, and 77. It can be assumed that weekday customer visits follow a normal distribution. Use Table 2. a. Construct a 90% confidence interval for the average number of customers who visit the salon on weekdays. (Round intermediate calculations to 4 decimal places, "sample mean" and "sample standard deviation" to 2 decimal places and "t" value to 3 decimal places, and final answers to 2 decimal places.) Confidence interval to b. Construct a 99% confidence interval for the average number of customers who visit the .

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Title ABC/123 Version X 1 Time to Practice – Week Three PSYCH/625 Version 1 2 University of Phoenix Material Time to Practice – Week Three Complete both Part A and Part B below. Part A Some questions in Part A require that you access data from Statistics for People Who (Think They) Hate Statistics. This data is available on the student website under the Student Test Resources link. 1. For the following research questions, create one null hypothesis, one directional research hypothesis, and one nondirectional research hypothesis. a. What are the effects of attention on out-of-seat classroom behavior? Research Hypothesis: There will be a relationship between the effects of attention on out-of-seat classroom behavior versus in-seat-classroom behavior. b. What is the relationship between the quality of a marriage and the quality of the spouses’ relationships with their siblings? Null Hypothesis: There will be no relationship in the relationship between the quality of a marriage and the quality of the spouses’ relationship with their siblings. c. What is the best way to treat an eating disorder? One Directional Research Hypothesis: 2. Provide one research hypothesis and an equation for each of the following topics: a. The amount of money spent on food among undergraduate students and undergraduate student-athletes b. The average amount of time taken by white and brown rats to get out of a maze c. The effects of Drug A and Drug B on a disease d. The time to complete a task in Method 1 and Method 2 3. Why does the null hypothesis presume no relationship between variables? 4. Create a research hypothesis tested using a one-tailed test and a research hypothesis tested using a two-tailed test. 5. What does the critical value represent? 6. Given the following information, would your decision be to reject or fail to reject the null hypothesis? Setting the level of significance at .05 for decision making, provide an explanation for your conclusion. a. The null hypothesis that there is no relationship between the type of music a person listens to and his crime rate (p < .05). In Hypothesis Testing, we typically deem a research hypothesis to be significant, if the odds of two means actually being equal are no greater than 1 in 20 or .05 (5%) or less. b. The null hypothesis that there is no relationship between the amount of coffee consumption and GPA (p = .62). c. The null hypothesis that there is a negative relationship between the number of hours worked and level of job satisfaction (p = .51). 7. Why is it harder to find a significant outcome (all other things being equal) when the research hypothesis is being tested at the .01 rather than the .05 level of significance? At the .01 level, there is less room for error because the test is more rigorous. 8. Why should we think in terms of “failing to reject” the null rather than just accepting it? 9. When is it appropriate to use the one-sample z test? 10. What similarity does a z test have ...

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Answer Sheet ISDS 361B HW5 YOUR FULL NAME: Answer Optional for Partial Credit 1. [12 pts.] Forecast for Saturday in week 6: No. of Periods of Data Collected = No. of Periods in Season = MSE = MAD = MAPE = LAD = 2. [18 pts.] a. Forecast (exponential smoothing): No. of Periods of Data Collected = Smoothing Constant (alpha) = Initial Forecast Value = b. Forecast (weighted MA): MSE = MAD = MAPE = LAD = c. I would recommend weighted MA (True/ False): 3. [12 pts.] Forecast for year 8: MSE = MAD = MAPE = LAD = 4. [18 pts.] Forecast for Summer Year 5: No. of Periods of Data Collected = No. of Periods in Season = Coefficients: Intercept = Period = 1 = 2 = Page 1 of 2 1) What is the critical F value for a sample of 7 observations in the numerator and 6 in the denominator? Use a two-tailed test and the 0.1 significance level. (Round your answer to 2 decimal places.) F 2) Arbitron Media Research Inc. conducted a study of the iPod listening habits of men and women. One facet of the study involved the mean listening time. It was discovered that the mean listening time for men was 29 minutes per day. The standard deviation of the sample of the 10 men studied was 8 minutes per day. The mean listening time for the 12 women studied was also 29 minutes, but the standard deviation of the sample was 15 minutes. At the .10 significance level, can we conclude that there is a difference in the variation in the listening times for men and women? (Round your answer to 3 decimal places.) The test statistic is . Decision 3) The following is sample information. Test the hypothesis that the treatment means are equal. Use the 0.01 significance level. Treatment 1 Treatment 2 Treatment 3 7 4 4 4 5 7 6 5 6 6 4 5 (a) State the null hypothesis and the alternate hypothesis. H0 H1 (b) What is the decision rule? (Round your answer to 2 decimal places.) H0 if the test statistic is greater than . (c&d) Compute SST, SSE, and SS total and complete an ANOVA table. (Round SS, MS and F values to 3 decimal places.) Source SS df MS F Treatments Error Total (e) State your decision regarding the null hypothesis. H0 4) A senior accounting major at Midsouth State University has job offers from four CPA firms. To explore the offers further, she asked a sample of recent trainees how many months each worked for the firm before receiving a raise in salary. The sample information is submitted to MINITAB with the following results: Analysis of Variance Source DF SS MS F Factor 5 36.39 7.28 1.92 Error 12 45.54 3.80 Total 17 81.93 Reject if F > . (Round your answer to 2 .

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