问题详情

A researcher is testing the hypothesis that a population mean is equal to zero. From a sample with 64 observations, the researcher calculates a sample mean of -2.5 and a sample standard deviation of 8.0. At which levels of significance should the researcher reject the hypothesis？
1% significance 5% significance 10% significance
A) Reject Fail to reject Fail to reject
B) Fail to reject Fail to reject Reject
C) Reject Reject Reject
D) Fail to reject Reject Reject