问题详情

Aresearcheristestingthehypothesisthatapopulationmeanisequaltozero.Fromasamplewith64observations,theresearchercalculatesasamplemeanof-2.5andasamplestandarddeviationof8.0.Atwhichlevelsofsignificanceshouldtheresearcherrejectthehypothesis？
1%significance5%significance10%significance
A)RejectFailtorejectFailtoreject
B)FailtorejectFailtorejectReject
C)RejectRejectReject
D)FailtorejectRejectReject