Please do your calculation for the following question in your paper and submit it separately to get partial credit if your answer in multiple choice is not correct.

According to the above problem, $H_0$:${}_d=0vs{H}_a$:${}_{d}0$

A$.t=1\mathrm{.}645$ and conclusion: reject $HO$

B$.z=2\mathrm{.}096$ and conclusion: reject $HO$

C$.z=1\mathrm{.}96$ and conclusion: do not reject $HO.$

D$.t=2\mathrm{.}256$ and conclusion: reject $HO$