a. Explain why the IQ score is a continuous variable.

b. What are the mean and the standard deviation for the distribution of IQ scores? SAT scores? Standard scores?

c. Express, algebraically or as an equation, the relationship between standard scores and IQ scores and between standard scores and SAT scores.

d. What standard score is 2 standard deviations above the mean? What IQ score is 2 standard deviations above the mean?

What SAT score is 2 standard deviations above the mean?

e. Compare the information about percentage of distribution shown in Figure 2.2 above with the empirical rule studied in Chapter 2. Explain the similarities.