#13. Given info: n1 = 64, Xbar1 = 53.3, s1 = 3.6, n2 = 65, Xbar2 = 51.3, s2 = 4.5 .
We are to test if light users (group 1) have a higher mean than heavy users (group 2), so H1 has to be µ1-µ2 > 0, so that means H0 must be µ1-µ2 = 0.
#14. This uses the same info as on #13, but it is a confidence interval problem. Look in your book for the confidence interval formula for the difference of two means.
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