Refer to the Journal of Consumer Research (August 2011) study of the last name effect in acquisition timing, Exercise 8.13. Recall that the mean response times (in minutes) to acquire free tickets were compared for two groups of MBA students-those students with last names beginning with one of the first 9 letters of the alphabet and those with last names beginning with one of the last 9 letters of the alphabet. Summary statistics for the two groups are repeated in the table.

a. Find a 95% confidence interval for the ratio of the true variances in response times for the two groups on the printout and interpret the result.
b. On the basis of the interval, can you conclude that one group has a larger variance in response time than the other? Explain.
c. How does your answer to part b affect the inference you made regarding the difference in mean response times in Exercise 8.13?

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First 9 Last 9 Letters: Letters: R-Z 25 A-H Sample size: 25 Mean response time (minutes): 25.08 19.38 Standard deviation (minutes): 10.41 7,12