Stat 200
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condition, what are dfn and dfe?
17. The following data are from a hypothetical study on the effects of age and time on scores on a test of reading comprehension. Compute the analysis of variance summary table.

12 years old 
16 year old 
30 minutes 
66 68 59 72 46 
74 71 67 82 76 
60 minutes 
69 61 69 73 61 
95 92 95 98 94 
Using the case study below for the next 2 questions. http://onlinestatbook.com/2/case_studies/adhd.html
28. (AT) The dataset ADHD Treatment has four scores per subject. a. Is the design betweensubjects or withinsubjects? b. Create an ANOVA summary table.
29. (AT) Using the Anger Expression Index from the Angry Moods study as the dependent variable, perform a 2×2 ANOVA with gender and sports participation as the two factors. Do athletes and nonathletes differ significantly in how much anger they express? Do the genders differ significantly in Anger Expression Index? Is the effect of sports participation significantly different for the two genders?
Use the following information to answer the next two exercises. Suppose a group is interested in determining whether teenagers obtain their drivers licenses at approximately the same average age across the country. Suppose that the following data are randomly collected from five teenagers in each region of the country. The numbers represent the age at which teenagers obtained their drivers licenses.

Northeast 
South 
West 
Central 
East 

16.3 
16.9 
16.4 
16.2 
17.1 

16.1 
16.5 
16.5 
16.6 
17.2 

16.4 
16.4 
16.6 
16.5 
16.6 

16.5 
16.2 
16.1 
16.4 
16.8 
x= 





s^{2}= 





H0: Î¼1 = Î¼2 = Î¼3 = Î¼4 = Î¼5
HÎ±: At least any two of the group means Î¼1, Î¼2, â€¦, Î¼5 are not equal.
61. degrees of freedom â€“ numerator: df(num) = _________
63. F statistic = ________
69. A researcher wants to know if the mean times (in minutes) that people watch their favorite news stations are the same. Suppose that the tableshows the results of a study.
CNN 
FOX 
Local 
45 
15 
72 
12 
43 
37 
18 
68 
56 
38 
50 
60 
23 
31 
51 
35 
22 

Assume that all distributions are normal, the four population standard deviations are approximately the same, and the data were collected independently and randomly. Use a level of significance of 0.05.
71. Are the mean number of times a month a person eats out the same for whites, blacks, Hispanics and Asians? Suppose that the table below shows the results of a study.
White 
Black 
Hispanic 
Asian 
6 
4 
7 
8 
8 
1 
3 
3 
2 
5 
5 
5 
4 
2 
4 
1 
6 

6 
7 
Assume that all distributions are normal, the four population standard deviations are approximately the same, and the data were collected independently and randomly. Use a level of significance of 0.05.
77. A grassroots group opposed to a proposed increase in the gas tax claimed that the increase would hurt workingclass people the most, since they commute the farthest to work. Suppose that the group randomly surveyed 24 individuals and asked them their daily oneway commuting mileage. The results are as follows.
Working class 
Professional(middle class) 
Professional(wealthy) 
17.8 
16.5 
8.5 
26.7 
17.4 
6.3 
49.4 
22 
4.6 
9.4 
7.4 
12.6 
65.4 
9.4 
11 
47.1 
2.1 
28.6 
19.5 
6.4 
15.4 
51.2 
13.9 
9.3 
Determine whether or not the variance in mileage driven is statistically the same among the working class and professional (middle income) groups. Use a 5% significance level.
81. Is the variance for the amount of money, in dollars, that shoppers spend on Saturdays at the mall the same as the variance for the amount of money that shoppers spend on Sundays at the mall? Suppose that the table below shows the results of a study.
Saturday 
Sunday 
Saturday 
Sunday 
75 
44 
62 
137 
18 
58 
0 
82 
150 
61 
124 
39 
94 
19 
50 
127 
62 
99 
31 
141 
73 
60 
118 
73 

89 

