Many people believe that fatal DWI crashes occur because of casual drinkers who

Question

Many people believe that fatal DWI crashes occur because of casual drinkers who tend to binge on Friday and Saturday nights, whereas others believe that fatal DWI crashes are caused by alcoholics who drink every day of the week. In a study of fatal car crashes, 216 cases are randomly selected from the pool in which the driver was found to have a blood alcohol content over 0.10. These cases are broken down according to the day of the week, with the results listed below. Using a 0.05 significance level, you need to test the claim that such fatal crashes occur on the different days of the week with equal frequency. What is the expected frequency of fatal car crashes on Friday? a. 0.04 b. 9.00 c. 30.86 d. 32.00 e. 228.86 Given the test statistic has a value of 7.42, what conclusion should you make? a. Because p-value

Explanation / Answer

applying chi square goodness of fit test:

34)

expected frequency =30.86

option c is correct

35)

option C is correct

observed Expected Chi square days Probability O E=total*p =(O-E)^2/E Sun 1/7 40.000 30.86 2.71 Mon 1/7 24.000 30.86 1.52 Tue 1/7 25.000 30.86 1.11 Wed 1/7 28.000 30.86 0.26 Thu 1/7 29.000 30.86 0.11 Fri 1/7 32.000 30.86 0.04 Sat 1/7 38.000 30.86 1.65 1 216 216 7.4167

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