Question

When engaging in weight-control (fitness/fat burning) types of exercise, a person is expected to attain approximately 60% of his or her maximum heart rate. For 20-year-olds, this rate is approximately 120 bpm. A simple random sample of thirty 20-year-olds was taken, and the sample mean was found to be 107 bpm, with a standard deviation of 45 bpm. Researchers wonder if this is evidence to conclude that the expected level is actually lower than 120 bpm.

a)Compute the observed test statistic:

b)What are the degrees of freedom?

c)Compute the p-values

d)What decision do you make about the hypothesis test?Based on your decision, what is the conclusion of the test?

e)changing the difference from -13 to -10

f)changing standard deviation from 45 to 40

Answer 1