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.
