A farmer has decided to employ a new additive to grow his crops. He divided his farm in 10 plots and kept records of corn yield (in bushels) before as well as after using the additive. The results are shown below.
Plot: 1 2 3 4 5 6 7 8 9 10
Before 9 9 8 7 6 8 5 9 10 11
After 10 9 9 8 7 10 6 10 10 12
You wish to test the following hypothesis at the one percent level of significance.
H0: ?D = 0 against H1: ?D ? 0.
What decision rule would you employ? 14) ______
A) Reject H0 if test statistic is less than -3.250 or greater than 3.250.
B) Reject H0 if test statistic is greater than 3.250.
C) Reject H0 if test statistic is less than -3.250.
D) Reject H0 if test statistic is greater than -3.250 or less than 3.250.