The pulse rates of

144

randomly selected adult males vary from a low of

40

bpm to a high of

112

bpm. Find the minimum sample size required to estimate the mean pulse rate of adult males. Assume that we want

98%

confidence that the sample mean is within

4

bpm of the population mean. Complete parts (a) through (c) below.

Question content area bottom

Part 1

a. Find the sample size using the range rule of thumb to estimate

.

n=enter your response here

(Round up to the nearest whole number as needed.)

Part 2

b. Assume that

=10.8

bpm, based on the value

s=10.8

bpm from the sample of

144

male pulse rates.

n=enter your response here

(Round up to the nearest whole number as needed.)

Part 3

c. Compare the results from parts (a) and (b). Which result is likely to be better?

The result from part (a) is

the same size as

smaller than

larger than

the result from part (b). The result from

part (a)

part (b)

is likely to be better because

it is smaller.itissmaller.

it is larger.itislarger.

it uses a better estimate of sigma .