Assignment 7

Answer the following questions.

1. What percentage of the general population have deviation IQs higher than 115?

2. What proportion of the normal curve lies between a Z-score of -2.50 and a Z-score of 1.50?

3. What proportion of the scores in a normal distribution are higher than a T-score of 70?

4. What Z-score has 90% of the scores below it?

5. What deviation IQ score ranges would include 90% of the population?

Quiz 7

1. The shape of the normal curve is

a. Negatively skewed b. Positively skewed

c. Symmetrical d. More than one of the above

2. Approximately what proportion of the normal curve is lower than the mean?

a. 25 % b. 50 % c. 75 % d. 100%

3. Which of the following is the formula for a Z-score

a.