may I get help and explanation my practice questions for final both please

Use the following information to answer the following 6 questions. Dr. Henry John Deutschendorf Jr. (AKA John Denver) investigated whether his new 'Sunshine on My Shoulders' therapy would increase self-esteem in those diagnosed with low self-esteem. The population mean for those diagnosed with low self- esteem is 69; however the population standard deviation is unknown. Dr. Denver selects 8 participants diagnosed with low self-esteem to participate in his new therapy for 6 months; the sample mean is 75. The data are listed below. Dr. Denver wants to maximize the power of the test. X 81 80 79 78 76 75 71 60 Mean 75What is the value of the appropriate test statistic for the statistical test of the mean? Note: Round answer to 3 Decimal Places. Question 41 2 pts What is the correct Critical Value for this statistical test of the mean? (Input same number of decimal places as presented in Table)