A study of 100 pet owners revealed that this group has an average heart rate (X)

Question

A study of 100 pet owners revealed that this group has an average heart rate (X) of 70 beats per minute. By constructing confidence intervals (CI)around this sample mean a researcher discovered that the population mean of 72 was contained in the 99% CI but not in the 95% CI. This implies that

a. Pet owners differ from the population at the .05 level, but not at the.01 level.

b. Pet owners differ from the population the .01 level, but not at the .05 level.

c. Pet owners differ from the population at both the.05 and the .01 level.

d. Pet owners differ from the population at neither the .05 nor the .01 level.

Explanation / Answer

Given that the population mean of 72 was contained in the 99% CI but not in the 95% CI. So,

Pet owners differ from the population at the .05 level, but not at the.01 level.

Option A is correct.

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