Determine the smallest sample size required to estimate the population mean under the following specifications: a. e

Question:

Determine the smallest sample size required to estimate the population mean under the following specifications:
a. e = 2.4, confidence level = 80% , data between50 and 150
b. e = 2.4, confidence level = 90%, data between50 and 150
c. e = 1.2, confidence level = 90%, data between50 and 150
d. e = 1.2 confidence level = 90%, data between25 and 175