Question: A random sample is selected from a normal population with a mean of = 30, and the = 7. After a treatment is administered, the

A random sample is selected from a normal population with a mean of = 30, and the = 7. After a treatment is administered, the sample mean is found to be M = 33.

If the sample consists of 16 scores, is the sample mean sufficient to conclude that the treatment has a significant effect:

a. With a two-tailed test and an alpha level of .05?

b. With a one-tailed test and an alpha level of .05?

c. With a one-tailed test and an alpha level of .01?

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