help with 31 c.

A sample mean, sample size, population standard deviation, and confidence level are provided. Use this information to complete parts (a) through (c) below. x = 54. n = 16. 6 =4. confidence level = 99% . . . . . O c. Obtain the margin of error by using the formula E = Z Identify the critical value. Z a =(Type an integer or decimal rounded to two decimal places as needed.) IN What is the margin of error obtained using the methods of parts (b) and (c)? (Tune an intener or decimal munded to one decimal place as needed )