# An observed frequency distribution of sample IQ scores is as follows: a. Assuming a normal distribution with /A = 100

## Question:

a. Assuming a normal distribution with /A = 100 and Ïƒ = 15, use the methods given in Chapter 5 to find the probability of a randomly selected subject belonging to each class. (Use class boundaries of 79.5, 95.5, 110.5, 120.5.)

b. Using the probabilities found in part (a), find the expected frequency for each category.

c. Use a 0.01 level of significance to test the claim that the IQ scores were randomly selected from a normally distributed population with Î¼ = 100 and Ïƒ = 15.

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