Questions 16 to 22: In a random sample of 25 shoppers at a grocery store, the sample mean amount spent was $25.50 and the sample standard deviation was $12.05. Assume the population was not skewed heavily. Calculate a 99% confidence interval for the true population mean amount spent at the grocery store. IE. Give the point estimate. Round to two decimal places. [2 points) 1?. Calculate the standard error. Round to two decimal places. (2 points) 13. Determine the critical value. Round to four decimal places. (2 points) 19. Calculate the margin of error. Round to two decimal places. (2 points) 21:. Calculate the condence interval. (2 points) 21. Interpret the condence interval [if you were not able to determine one use (17, 30)). {3 points) 22. Based on the condence interval you calculated is there evidence that the population mean spent at the grocery store is more than $20? (circle one) (2.5 points) Yes No