Assume that the results from the survey last week

Question:

1. Maximum Driving Speeds

Assume that the results from the survey last week represent a random sample of the

population. Use the Excel spreadsheet and GRETL for this question.

A. Test the hypothesis that there is no difference in the variance of

maximum driving speeds (in miles per hour) for male drivers compared to female

drivers. What can you conclude at the 5-percent level of significance?

B. Suppose someone makes a claim that males drive faster than females.

What are the null and alternative hypotheses? What is the value of the test

statistic? What can you conclude at the 5-percent level of significance? Briefly

explain.

2. More Univariate Hypothesis Testing

For this question, show the results "by hand" and also use GRETL to check your work.

Suppose that researchers want to test the effectiveness of a new anti-anxiety medication.

In clinical testing, 20 out of 100 people taking the medication report symptoms of

anxiety. Of the people receiving a placebo, 60 out of 200 individuals report symptoms of

anxiety. Is the medication working any differently than the placebo? Test this claim

using the 5-percent level of significance. Show your work and explain.

significance? Briefly explain.

Female
70
113
85
75
96
70
120
85
90
120
110
103
60
100
100
100
80
90

Male
105
85
130
110
125
95
124
110
120
110
100
92
120
130
90
120
130
110
95
156
120
80
90
105
110
130
85
140
95
140
95
138
114
120
155
130
40
95
120
113
135
120
150
95
130
120