Question: 4. z Scores and Areas What is the difference between a z score and an area under the graph of a normal probability distribution? Can

4. z Scores and Areas What is the difference between a z score and an area under the graph of a normal probability distribution? Can a z score be negative? Can an area be negative?

IQ Scores. In Exercises 5–12, assume that adults have IQ scores that are normally distributed with a mean of 100 and a standard deviation of 15 (as on the Wechsler test).

(Hint: Draw a graph in each case.)

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