Suppose you want to test the claim the paired sample data given below come from a population for which the mean difference is



.



x 77 76 68 83 85 80 50

y 83 93 81 86 69 77 62



Use a 0.05 significance level to find the following:

AThe mean value of the differences d for the paired sample data

BThe standard deviation of the differences d for the paired sample data.

CThe t-test statistic.

DThe positive critical value.