You want to study the mean incubation period of COVID-19 (the amount of time a person has the virus before they show symptoms). To do this, you monitor 15 of your friends and determine their incubation times. The distribution of incubation times in the sample is as follows: LO Frequency 1 2 3 o 2 3 5 6 7 8 times Your goal is to infer the population mean incubation time for all people. Which of the following are correct statements? (Choose all that apply) O The sample size is too small for a t-test to be performed Of all the tests we have studied, a z-test is most appropriate for this situation. The distribution of sample mean incubation times will likely be normally distributed by the Central Limit Theorem O This study may be affected by selection bias in the sample. A t-test is not applicable in this situation because of strong outliers The sample mean is not the best measure of the center incubation time in the population distribution