Reference no: EM131870333

A retail store executive wants to know whether the store's Internet sales exceed its mailorder sales. A random sample of 15 Internet sales yielded a mean sale amount of $86.40, with a standard deviation of $18.75. A random sample of 10 mail-order sales yielded a mean sale amount of $75.20, with a standard deviation of $14.25. Do these data indicate that the true mean Internet sale amount exceeds the true mean mail-order sale amount? Perform the test of hypothesis assuming that the population variances are equal and that two populations from which the samples are drawn are normally distributed. Use a significance level of α = .01.