TEST 3: z-test.THE IQ PILL: DOES IT AFFECT IQ?

Say we randomly selected 100 people, gave them an IQ pill that we predict affects IQ, measured their IQ, and found their mean ) to be 108 where = 103 and = 12

Steps

1.Determine the experimental hypothesis and create the statistical hypothesis

ExperimentalStatistical

2.Set up the sampling distribution.

Select

Locate region of rejection

Determine critical value

3.Compute the and

=

4.Compare and

If lies beyond then reject , accept , and say the results are "significant."Then describe the relationship.

Ifdoes not lie beyond , do not reject , and say the results are "nonsignificant."

Do not draw any more conclusions about the relationship.