Suppose that we want to estimate the mean score on a nationwide examination in anthropology, and for this purpose we cho

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Suppose That We Want To Estimate The Mean Score On A Nationwide Examination In Anthropology And For This Purpose We Cho 1 (45.27 KiB) Viewed 65 times

Suppose that we want to estimate the mean score on a nationwide examination in anthropology, and for this purpose we choose a random sample of exam scores. The sample we choose has a mean of 515 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.) could use either Z or unclear Sampling Scenario Z t O о O O O O o o (1) The sample has size 20, and it is from a normally distributed population with a known standard deviation of 76. (2) The sample has size 105, and it is from a non- normally distributed population with a known standard deviation of 76. (3) The sample has size 17, and it is from a population with a distribution about which we know very little. (4) The sample has size 14, and it is from a normally distributed population with unknown standard deviation. o O o о о о о o о o (5) The sample has size 75, and it is from a non- normally distributed population. o o o Х ?