O Construct a confidence interval of a survey of annual earnings of Gateway students, using the following data: X= $54,000, s=$1,400. Size of the survey (n) is 50 students. a) Use the .98 confidence...

Please round it to 4 decimal places and add the excel formulas as well.

Extracted text: O Construct a confidence interval of a survey of annual earnings of Gateway students, using the following data: X= $54,000, s=$1,400. Size of the survey (n) is 50 students. a) Use the .98 confidence level. b) Change the confidence level to .95 and construct a confidence interval. c) Use the .95 confidence level and increase the "n" to 576 to find the confidence interval.