The pulse rates of 145 randomly selected adult males vary from a low of 45 bpm to a high of 117 bpm. Find the minimum sample size required to estimate the mean pulse rate of adult males. Assume that we want 95% confidence that the sample mean is within 33 bpm of the population mean. Complete parts? (a) through? (c) below.
(a). Find the sample size using the range rule of thumb to estimate ?.
n=
(b) Assume that ? = 10.9 bpm, based on the value s =10.9 bpm from the sample of 145 male pulse rates.
n =
(c). Compare the results from parts? (a) and? (b). Which result is likely to be? better?