MULTIPLE CHOICE. Computing Test Statistic on Population Mean. can you please help me to answer this? and may I know the solution/explanation of each number? Thanks in advance.I will mark it helpful

Computing Test Statistic on Population Mean Directions: Choose the best answer to the given questions or statements. 1. What test statistic will be used if the sample size is below 30? A. t-test C. population mean B. z-test D. standard deviation 2. In using t-test for a population mean, we assume that the sample is selected randomly. The given statement is: A. always true C. sometimes true B. always false D. sometimes false 3. If the population standard deviation is unknown, what test statistic is to be used? A. t-test C. population mean B. z-test D. standard deviation 4. In finding the t-computed value, which formula should be used? A t= #1 B. t = #1 D. t = $4 5. When should you use the z-test? I. When you are testing for a population mean Il. When the population standard deviation is given Ill. When the sample standard deviation ONLY is given IV. When you are testing with small sample sizes, n