You sample 25 observations from a sample of unknown variance. You calculate a sample mean of 70 and sample standard deviation of 60. You wish to conduct a two-tailed test of the null hypothesis that the mean is equal to 50. The most appropriate test statistic is a:
You sample 25 observations from a sample of unknown variance. You calculate a sample mean of 70 and sample standard deviation of 60. You wish to conduct a two-tailed test of the null hypothesis that the mean is equal to 50. The most appropriate test statistic is a: A.z-statistic of 1.67; B.z-statistic of 0.33; C.t-statistic of 0.33 with 24 degrees of freedom; D.t-statistic of 1.67 with 24 degrees of freedom