Chapter 9, Problem 78SE

Self-Driving Cars A survey of asked respondents how long (in years) they thought it would be before self-driving cars were the majority of vehicles on the road, and a random sample from this survey was selected. The data are available at the text’s website. (Source: StatCrunch Survey: Responses to self-driving cars. Owner: scsurvey)

a. Find a $95\%$ confidence interval for the difference in mean lengths of time before self-driving cars are the majority of vehicles on the road between males and females.

b. Use a significance level of $0.05$, test the hypothesis that the mean lengths of time for males and females are significantly different.