An independent consumer group tested radial tires from two major brands to determine whether there were any differences in the expected tread life. The data (in thousands of miles) are given here:

a. Analyze these data using parallel boxplots.
b. Conduct the appropriate hypothesis test using a 0.05 significance level.
c. Construct a 95% confidence interval for the true difference in the mean tread lives.
d. What did you assume to do the analyses'? Can you evaluate how well these data meet the assumptions? If yes, determine how comfortable you are with them. If not, explain why.
e. Discuss the conclusions of the hypothesis test and confidence interval relative to the boxplot.

Transcribed Image Text:

Brand 1 50 54 52 47 61 56 51 51 48 56 53 43 58 52 48 Brand 2 57 61 4752 53 57 56 53 67 58 62 56 56 62 57