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I, ________________________________ AM going to understand z-scores!

1. For the z-scores below find the percentile rank (the % of data below the given z-value).

A. z = 2.24 B. z = -1.65

C. z = 1.47 D. z = -.47

2. For the z-scores below find the percent of the data that falls above the z-value.

A. z = .24 B. z = -1.11

C. z = 1.22 D. z = -2.07

3. For the z-scores below find percent of the data that falls between the two z-scores.

A. z = -.38 & z = 1.63 B. z = .88 & z = 1.55

C. z = -1.93 & z = 1.09 D. z = -2.22 & z = - 1.34

4. For the percents below, find the corresponding z-scores.

A. 45% B. 96%

5. A distribution of scores has a mean of 50, and a standard deviation of 10. Find the z-scores corresponding to the following values:

A. A score that is 20 points below the mean

B.  A score that is 15 points above the mean

C.  A score that is 7 points above the mean

6. A distribution of test scores has a mean of 75, and a standard deviation of 8. Find the percentiles that go with the following z-scores corresponding to the following values:

A. A test score of 85 B. A test score of 70

7. A distribution of SAT scores has a mean of 450, and a standard deviation of 85. Find the SAT scores that go with the following percentiles:

A. The 85th percentile B. The 23rd percentile

(so 85% of the scores are below what value)

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