For items 1 through 12, fill in the blank with the correct response (6 points each).
1. We typically assume that variables are distributed because we
know how well this shape fits most data distributions.
2. What percent of cases under the normal curve fall within plus or minus one standard
deviation of the mean?
3. In a normal distribution, you have a percent chance of randomly selecting
a case that falls within plus or minus three standard deviations of the mean.
4. If you run an analysis and find that the mean is 64 and the standard deviation is 7, exactly
68.26 percent of cases will fall between what two values?
5. What percent of cases under the normal curve fall within plus or minus two standard
deviations of the mean?
6. If you run an analysis and find that the mean is 79 and the standard deviation is 11,
exactly 95.44 percent of cases will fall between what two values?
7. In a normal distribution, you have a percent chance of randomly
selecting a case that falls within two standard deviations (above or below) of the mean.
8. What percent of cases under the normal curve fall within plus or minus three standard
deviations of the mean?
9. If you run an analysis and find that the mean is 42 and the standard deviation is 2, exactly
99.72 percent of cases will fall between what two values?
10. If we convert raw scores to units of the raw score distribution's standard deviation, we
are creating
11. is a deliberate sampling process that makes the laws of
probability work.
12. In a normal distribution, you have a percent chance of randomly
selecting a case that falls within one standard deviation (above or below) of the mean.
