Econometrician is planning to estimate the mean weight loss of his patients. He believes that the standard deviation of the population of weight losses is around 10 grams. Using 90% confidence,...

Extracted text: Econometrician is planning to estimate the mean weight loss of his patients. He believes that the standard deviation of the population of weight losses is around 10 grams. Using 90% confidence, determine how large a sample should be if he takes to estimate the average weight loss to within 2 grams a) None of the answers are correct b) Approximately 88 O Approximately 78 O) Approximately 58 e) Approximately 68