(10 marks) Calculate the smallest sample size required to estimate the population mean under the following specifications: = 0.5 (a) (2 marks) confidence level 95%, = 16, and margin of error e = 4 (b) (2 marks) confidence level 90%, = 23, and margin of error e = (c) (2 marks) confidence level 99%, = 0.5, and margin of error e = 1 (d) (2 marks) confidence level 98%, = 1.5, and margin of error e = 0.2 (e) (2 marks) confidence level 95%, = 6, and margin of error e = 2.