Two researchers, Dr. John and Dr. Smith, are studying the relationship between h

Question

Two researchers, Dr. John and Dr. Smith, are studying the relationship between how many minutes per day a man exercises and his resting heart rate. Each researcher compares two samples of 200 men aged 50-65. One sample spends less time exercising, the other spends more time. The following table shows the mean and standard deviations of resting heart rate, as they might be shown in a journal article. The summary data from _______ study demonstrates a stronger relationship between how many minutes per day a man exercises and his resting heart rate. Suppose you predict resting heart rate for a member of each of the four populations sampled two researchers. Assuming the estimates of the population standard deviations are accurate, your prediction is most likely to be closest to the true value for a man aged 50-65 who: Exercises 15-60 minutes per day Exercises more than 30 minutes per day Exercises more than 60 minutes per day Exercises 0-30 minutes per day

Explanation / Answer

The summary data from research study demonstrates a stronger relationship between how many minutes per day a man exercises and his resting heart rate.

Mean value is of resting heart rate of sample in study. Standard deviation is spread of the mean values. Thus the study with less magnitude of standard deviation is the accurate minutes of excercise for man aged 50-65. That shows variation is less.

Therefore from above four populations the least standard deviation = 9.01. Thus the research study done by Dr.Smith for Exercises need to be for 0-30mins is accurate.

Thus , Option D is answer.

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