On a 50-question test, a student answered 5 questions incorrectly. what percent did the student answer correctly? a. 55% b. 45% c. 10% d. 90%

Arandom sample of 45 observations results in a sample mean of 68. the population standard deviation is known to be 23 a. compute the margin of error at a 959% confidence interval. b. compute the 95% confidence interval for the population mean c. compute the 90% confidence interval for the population mean. d. compute the 75% confidence interval for the population mean