Consumer reports would like to conduct a hypothesis test to determine if the average battery life for an ipad is different from the average battery life for a kindle fire. the following data represents the battery life from a random sample of ipads and kindle fires in hours. assume that the population variances are equal.
ipad 9 5 8 7 8 9 11 11
kindle 10 9 10 9 12 10 10
a). use the critical value approach to test this hypothesis with α = 0.02.
b). use the p-value approach to test this hypothesis with α = 0.02.
c). construct a 98% confidence interval for the difference in population mean and interpret the results.