We conduct a one-sample experiment to determine if performing 15 minutes of medi

Question

We conduct a one-sample experiment to determine if performing 15 minutes of meditation affects an individual’s stress levels. The mean stress levels for the sample of n=31 individuals is 73.2. We compute a t= +2.98. Is this a one- or two-tailed test? What are the experimental hypotheses? What is the critical t value? Are the result significant? Do you reject or retain/fail to reject the null hypothesis?

A researcher predicts that smoking cigarettes affects a person’s sense of smell. On a test of olfactory sensitivity, the mean for the population of nonsmokers is 18.4. A sample of 20 people who smoke a pack a day produces a sample mean of 16.25 with a estimated population variance of 5.43. Run a hypothesis test using a one-sample t-test with an alpha of 0.01, two-tailed test.

Explanation / Answer

SOLUTION1:

CLAIM: to determine if performing 15 minutes of meditation affects an individual’s stress levels.

ITS A TWO TAIL

T=+2.98

DEGREES OF FREEDOM=n-1=31-1=30

alpha=0.05

The P-Value is .005668.

The result is significant at p < .05.

yes the result significant

Reject null hypothesis'

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