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Homework Assignment from the Required Reading

Ch. 5: Complete #2, 4, & 8. Pgs. 90-91 (End of the Chapter)

You must show your work to receive full credit.

2. You scored at the mean on your first statistics test. What is your z-score?

4. Harry’s score was 66 on an exam that had a mean of 57 and a standard deviation of 6. Find and interpret Harry’s z-score.

8. A distribution of scores has a μ=75 and a σ=8. What is the z-score for the following Xvalues?

a.95

b.63

c.75

d.82

Ch. 6: Complete #2, 8, & 14. Pg. 106 (End of the Chapter)

2. Locate the probabilities associated with the following:

a. p(z > +1.25)

b. p(z > −2.10)

c. p(z < −1.87)

d. p(z < +2.68)

8. Given a normal distribution with a μ=112 and σ=10, what percentage of the popula-tion can be expected to score

a.lower than 100?

b.higher than 90?

14. Given a normal distribution with a μ=96 and σ=12, what raw score separates the lower 56% of the distribution from the upper 44%?