Part I: z Scores and the Unit Normal Table

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1

You can only use z scores to determine the probability of a score if

A

the z score is positive

B

the z score is negative

C

the population distribution is normally shaped

D

the population distribution is negatively skewed

E

the population distribution is positively skewed

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2

If the shaded area in your sketch is larger than half of the curve, use the _____of the unit normal table.

A

body column

B

tail column

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3

What proportion of z scores are equal to or greater than a z score of +1.2 on a normal curve?

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4

What proportion of z scores are equal to or greater than a z score of −0.75 on a normal curve?

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5

What proportion of scores are equal to or less than a z score of +0.66 on a normal curve?

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6

What proportion of scores are equal to or less than a z score of −1.65 on a normal curve?

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Part II: Computing z Scores and Finding Probabilities

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7

Use a z score to determine the proportion of people in the adult population who scored better than Henry on this memory test. Assume that the population of memory scores on this test is normally distributed.

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8