Need an explanation of which type of test these are.

4 Mail 10:52 AM Tue Dec 1 learnus-east1-prod-tleet02xythos.content.blackboardcdn.com c. An industrial/organizational psychologist is interested in whether a proposed company policy allowing employees to work from home might reduce the number of sick days employees take. The average number of sick days employees take across the entire company is 4.6 per year. In a one-year pilot program, a group of 30 employees are allowed to work from home whenever they like. During this year, employees in this group take an average of 3.2 sick days with a standard deviation of 1.3 days. Which NHST would the psychologist use to determine if the work-from-home policy reduced the number of sick days employees take? In a sentence, briey explain why this is the appropriate test. d. A researcher is interested in whether a new reading program can boost the reading prociency of elementary school students. The reading program is administered to a sample of 25 elementary school children. At the end of the program, the sample of students score an average of 27 on the Rothstein Test of Reading Prociency (RTRP). In the general population, the RTRP is scaled to have a mean of 25 and a standard deviation of 2 for elementary school students. Which NHST would the researcher use to determine if participation in the reading program boosts reading prociency? In a sentence, briey explain why this is the appropriate test