Suppose that we want to estimate the mean score on a nationwide examination in biology, and for this purpose we choose a random sample of exam scores.The sample we choose

has a mean of 505 and a standard deviation of 73 . For each of the following sampling scenarios, determine which test statistic is appropriate to use when making inference statements about the population mean. (In the table, Z refers to a variable having a standard normal distribution, and t refers to a variable having a t distribution.)