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# The pulse rates of 148 randomly selected adult males vary from a low of 45 bpm to a high of 121 bpm. Find the minimum sample size required to...

The pulse rates of 148 randomly selected adult males vary from a low of 45 bpm to a high of 121 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 3 bpm of the population mean. Complete parts​ (a) through​ (c) below.

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

σ=

​(Type whole​ number.)

b. Assume that sigma

σ=12.1 ​bpm, based on the value =12.1 bpm from the sample of 148 male pulse rates.=

​(Typ whole​ number.)

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 (b)

is likely to be better because it uses a better estimate of sigma .

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