The pulse rates of 162 randomly selected adult males vary from a low of 42 bpm to a high of 102 bpm. find the minimum sample size required to estimate the mean pulse rate of adult males. assume that we want 90% confidence that the sample mean is within 2 bpm of the population mean. complete parts (a) through (c) below.
a. find the sample size using the range rule of thumb to estimate σ
b. assume that σ = 11.5 bpm, based on the value s= 11.5 bpm from the sample of 152 male pulse rates
c. compare the results from parts (a) and (b). which result is likely to be better?
the result from part (a) is larger than the result from part (b). the result from part (a) is likely to be better because it uses a better estimate of σ.