Answer Happy

Select the true statement(s). In a hypothesis test concerning a population mean when the population standard deviation is unknown, the test statistic is based on the standard normal distribution when the sample size is greater than 30. In a hypothesis test concerning a population mean when the population standard deviation or is unknown, there are only three possible alternative hypotheses. In a hypothesis test concerning a population mean when the population standard deviation or is unknown, the test statistic is based on at distribution with n - 1 degrees of freedom, where n is the sample size. In a hypothesis test concerning a population mean when the population standard deviation or is unknown with alternative hypothesis Ha: > Ho, the value of the test statistic will always be greater than 0. In a hypothesis test concerning a population mean when the population standard deviation is unknown, the p value can never be determined. The hypothesis test concerning a population mean when the population standard deviation is unknown is valid only when the underlying population is normal.