Answer Happy

Suppose that we want to estimate the mean daily profit of a convenience store. For this purpose, we record the daily profit for a random sample of days. The sample has a mean of 454 dollars and a standard deviation of 77 dollars. 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 distribution

Sampling Scenario N t could use either Z or unclear t (1) The sample has size 75, and it is from a non- normally distributed population. O O o O o (2) The sample has size 18, and it is from a normally distributed population with a known standard deviation of 77. (3) The sample has size 10, and it is from a population with a distribution about which we know very little (4) The sample has size 100, and it is from a non- normally distributed population with a known standard deviation of 77. (5) The sample has size 16, and it is from a normally distributed population with unknown standard deviation. o 0 o