Question 3: To test for kidney function and presence of kidney disease, an estimated glomerular filtration rate (eGFR) is calculated from blood tests of creatinine, with lower score associated with poorer function. Up until 2021 the scores were calculated differently based on race (non-African American and African American). You are a part of research team that was able to recruit 21 healthy African American individuals to test their eGFR, the sample mean eGFR was 105 with a standard deviation of 6. *Not required* For more information on the recent changes and history of the eGFR and its impact: https://health.ucdavis.edu/blog/lab-best-practice/race-and-egfr-addressing-health-disparities-in- chronic-kidney-disease/2021/04 A) What would our critical value be for a lower tail test? Suppose we assume the population mean to be 90, what is your test statistic? C) What is your 95% Cl for this sample