A medical researcher wishes to estimate the serum cholesterol level of all women aged 18 to 24. There is strong evidence suggesting that o = 38. 7 (in milligrams per 100 millileters-mg/100 ml). If the researcher wants to be 99% confident of obtaining a sample mean that is off by no more than 6 units from the population mean, find the smallest sample necessary by first answering the following questions by first answering the following questions. Question: What is the margin of error E