Question 9 Not yet answered Points out of 1.00 Flag question What is the critical value of t for 95% confidence level and n=10? Select one; Oa. 2.2222 Ob. 2.2622 Oc. 2.2922 Question 10 Not yet answered Points out of 1.00 P Flag question What the sample size should be for a 95% confidence interval estimation of the population mean to within a sampling error of +- 5and the standard deviation of 157 Select one: Oa. 32 Ob. 33 Oc 35