# PSY-3301 Exam # 2

Question 1

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Spearman rho really derives from Pearson r.

Question 2

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A raw score that is 1 standard deviation above the mean of the raw score distribution will have a z score of 1.

Question 3

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On a test with a population mean of 75 and standard deviation equal to 16, if the scores are normally distributed, what percentage of scores fall between 70 and 80?

Question 4

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An economics test was given and the following sample scores were recorded:

Individual

A

B

C

D

E

F

G

H

I

J

Score

12

12

7

10

9

12

13

8

9

8

The standard deviation of the distribution is _________.

Question 5

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r decreases as N decreases.

Question 6

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It is possible to have a set of scores with three different values for central tendency.

Question 7

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A distribution has a mean of 60.0 and a standard deviation of 4.3. The raw score corresponding to a z score of -1.51 is _________.

Question 8

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An economics test was given and the following sample scores were recorded:

Individual

A

B

C

D

E

F

G

H

I

J

Score

12

12

7

10

9

12

13

8

9

8

The z score for individual D is _________.

Question 9

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In a negatively skewed distribution, the mean will generally be _______ the median.

Question 10

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The correlation coefficient when N = 2 is meaningless.

Question 11

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A z distribution always is normally shaped.

Question 12

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In a skewed distribution, the mean and median are equal.

Question 13

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The mean is the arithmetic average of the scores.

Question 14

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What is the value of r for the following relationship between height and weight?

Height

60

64

65

68

Weight

103

122

137

132

Question 15

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The variance is the square of the standard deviation.

Question 16

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If r = -1.00, the relationship is imperfect.

Question 17

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The closer the points on a scatter diagram fall to the regression line, the _________ between the scores.

Question 18

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Given the following set of scores

X: 10, 12, 6, 8, 9, 11, 13, 13, 5, 0, 1

What is the range?

Question 19

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Which of the following values of r represents the strongest degree of relationship between two variables?

Question 20

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When a correlation exists, lowering the range of either of the variables will _________.

Question 21

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A standardized test has a mean of 88 and a standard deviation of 12. What is the score at the 90th percentile? Assume a normal distribution.

Question 22

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The area beyond a z score of –1.12 is the same as the area beyond a z score of 1.12.

Question 23

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If the original raw score distribution has a mean that is not equal to zero, the mean of the z transformed scores will not equal zero either.

Question 24

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Given the following set of scores

X: 10, 12, 6, 8, 9, 11, 13, 13, 5, 0, 1

What is the value of ?

Question 25

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The median is most affected by unbalanced extreme scores.

Question 26

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The formula for the population standard deviation is

Question 27

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A scatter plot is used to help determine if the relationship is linear or curvilinear.

Question 28

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In order for the correlation coefficient to be negative, which of the following must be true?

Question 29

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If 5 points are added to each score in a distribution, which of the following will happen?

Question 30

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All bell-shaped curves _________.

Question 31

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A researcher wanted to know if the order in which runners finish a race is correlated with their weight. She conducts an experiment and the data are given below.

Finishing order

1

2

3

4

5

6

Weight (lbs)

110

114

112

108

116

113

The correlation for these data equals _________.

Question 32

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Which of the following is not a property of the mean?

Question 33

0.25 out of 0.25 points

An economics test was given and the following sample scores were recorded:

Individual

A

B

C

D

E

F

G

H

I

J

Score

12

12

7

10

9

12

13

8

9

8

The mean of the distribution is _________.

Question 34

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In a positive relationship, _________.

Question 35

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What is the appropriate symbol for the population standard deviation?

Question 36

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If the original raw score distribution is not normally distributed, the mean of the z transformation scores of the raw data will not equal 0.

Question 37

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A correlation coefficient expresses the direction but not the magnitude of a relationship.

Question 38

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Given the following set of scores

X: 10, 12, 6, 8, 9, 11, 13, 13, 5, 0, 1

What is the value of ?

Question 39

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If two variables are ratio scaled and the relationship is linear, what type of correlation coefficient is most appropriate?

Question 40

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If the relationship is imperfect, the value of the correlation coefficient must be negative.

Question 41

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In a plot of the normal curve, frequency is plotted on the X axis.

Question 42

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A relationship can be _________.

Question 43

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A testing bureau reports that the mean for the population of Graduate Record Exam (GRE) scores is 500 with a standard deviation of 90. The scores are normally distributed.

The percentile rank of a score of 667 is _________.

Question 44

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The equation used for sample standard deviation is an estimate of the population standard deviation.

Question 45

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In a normal distribution approximately _________ of the scores will fall within 1 standard deviation of the mean.

Question 46

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The range of a correlation coefficient is 0 to +1.

Question 47

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If scores are z scores and if r equals 1 then zX will always equal zY.

Question 48

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A distribution has a mean of 78 and a median of 92. This distribution is _________.

Question 49

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How much would your income be if its z score value was 2.58?

Question 50

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The easiest way to determine if a relationship is linear is to calculate the regression line.