Rhoda completed the right column of the table to help her find the sum of One-half and One-third. In which step did her first error occur? Step 1 Step 2 Step 3 Step 4

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