mg We want to conduct a hypothesis test of the claim that for middle-aged adults the population mean of their cholesterol levels is more than 202 We choose mg and a standard deviation of 19 dL mg a...

Extracted text: mg We want to conduct a hypothesis test of the claim that for middle-aged adults the population mean of their cholesterol levels is more than 202 We choose mg and a standard deviation of 19 dL mg a random sample of such levels. The sample has a mean of 197 For each of the following sampling scenarios, choose an appropriate test statistic for our hypothesis test on the population mean. Then calculate that statistic. Round your answers to two decimal places. Aa (a) The sample has size 16, and it is from a normally distributed population with a known standard deviation of 19.3. O z = O t = O It is unclear which test statistic to use. (b) The sample has size 17, and it is from a normally distributed population with an unknown standard deviation. O z = O t = O It is unclear which test statistic to use.