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 one hundred 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. To determine this, we test the following hypotheses:
H₀: μ= 120 versus H_a: μ< 120
What is the P-value for the one-sample t test for these hypotheses?

Question

Quizplus · Accepted Answer

The P-value for the one-sample t test for these hypotheses is less than 0.01. This is because the sample mean is significantly lower than the expected level of 120 bpm, and the standard deviation is relatively large. This suggests that the expected level of heart rate for 20-year-olds during weight-control exercise is actually lower than 120 bpm.

When Engaging in Weight-Control (Fitness/fat Burning) Types of Exercise, a Person