## PSY 315-In a population of scores, X = 83 corresponds

Question

In a population of scores, X = 83 corresponds to z = –0.50 and X = 93 corresponds to z = +2.00. What are the values for the population mean and standard deviation?

a.

m = 85 ands = 4

c.

m = 81 ands = 4

b.

m = 85 ands = 2

d.

m = 81 ands = 6

Under what circumstances is a score that is 15 points above the mean an extreme score relatively far from the mean?

a.

When the population mean is much larger than 15

b.

When the population standard deviation is much larger than 15

c.

When the population mean is much smaller than 15

d.

When the population standard deviation is much smaller than 15

For a sample of n = 100 scores, X = 45 corresponds to z = 0.50 and X = 52 corresponds to z = +1.00. What are the values for the sample mean and standard deviation?

a.

M = 31 and s = 7

c.

M = 38 and s = 7

b.

M = 31 and s = 14

d.

M = 38 and s = 14

A sample of n = 20 scores is transformed into z-scores. What is the value of SS, the sum of squared deviations, for the set of 20 z-scores?

a.

0

b.

19

c.

20

d.

Cannot be determined without more information

A population of scores hasm = 80. In this population, a score of X = 86 corresponds to z = +2.00. What is the population standard deviation?

a.

2

c.

6

b.

3

d.

12

In a population withs = 8, a score of X = 44 corresponds to a z-score of z = –0.50. What is the population mean?

a.

m = 36

c.

m = 48

b.

m = 40

d.

m = 52

A sample has M = 72 and s = 4. In this sample, what is the X value corresponding to z = –2.00?

a.

X = 70

c.

X = 64

b.

X = 68

d.

X = 60

For a sample with M = 80, a score of X = 88 corresponds to z = 2.00. What is the sample standard deviation?

a.

2

c.

8

b.

4

d.

16

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