Suppose that we want to estimate the mean PCB (Polychlorinated biphenyl) level in white croaker fish from the San Franci

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Suppose That We Want To Estimate The Mean Pcb Polychlorinated Biphenyl Level In White Croaker Fish From The San Franci 1 (44.79 KiB) Viewed 65 times

Suppose that we want to estimate the mean PCB (Polychlorinated biphenyl) level in white croaker fish from the San Francisco Bay. The sample we select has a mean of 622 parts per million and a standard deviation of 55 parts per million. 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.) Sampling Scenario Z t could use either Z or unclear t O O o o (1) The sample has size 15, and it is from a normally distributed population with unknown standard deviation. (2) The sample has size 90, and it is from a non- normally distributed population with a known standard deviation of 51. (3) The sample has size 16, and it is from a population with a distribution about which we know very little. o о o о o O о O O (4) The sample has size 75, and it is from a non- normally distributed population. O o о о 0 (5) The sample has size 19, and it is from a normally distributed population with a known standard deviation of 51. о O O Х Х $ ?