Question 1

The size of  depends on

Accepted Answer

A)    and 
B)  N and 
C)    and 
D)  z and E) A) and C)
F) A) and B)

Question 2

Alicia scored a 70 on her psychology quiz,but the class as a whole averaged a 40.If the standard deviation was 10,what was Alicia's z-score?

Accepted Answer

A)  3
B)  +3
C)  0.3
D)  +0.3E) A) and B)
F) A) and C)

Question 3

Pat's last statistics test score was 72.If the instructor tells Pat that the grade distribution was approximately normal,the class mean was 67,and the standard deviation was 3,which of the following is correct?

Accepted Answer

A)  A score of 72 is never good.
B)  Pat should be worried about this score,because many other students did better.
C)  Pat should be fairly happy about this score,because many students did not do as well.
D)  Pat should be ecstatic,because this is obviously one of the highest grades in the class.E) A) and B)
F) A) and D)

Question 4

Which of the following is NOT a way we apply the standard normal curve?

Accepted Answer

A)  finding relative frequency
B)  measuring variability
C)  finding simple frequency
D)  calculating the raw score for a specific percentileE) A) and D)
F) B) and D)

Question 5

For a distribution with  = 50 and  = 5,find the raw scores for the following z-scores: -1.2;-0.5;1.7;2.6

Accepted Answer

A)  44.00;47.50;58.50;63.00
B)  20.00;37.50;92.50;115.00
C)  47.32;48.88;53.80;55.81
D)  -20.00;-37.50;92.50;115.00E) All of the above
F) A) and B)

Question 6

z-scores communicate a score's

Accepted Answer

A)  absolute magnitude.
B)  relative standing in a distribution.
C)  distance from the population mean.
D)  variability.E) C) and D)
F) A) and D)

Question 7

What were the sample means that marked the middle 68% in the state if the population mean was 500 and the standard deviation (standard error) for the sampling distribution was 200?

Accepted Answer

A)  350 and 650
B)  300 and 700
C)  400 and 600
D)  450 and 550E) A) and B)
F) None of the above

Question 8

Using the appropriate values from the z-table in the textbook appendix,find the area above (beyond) z = +0.89.

Accepted Answer

A)  0.3133
B)  0.1867
C)  -0.3133
D)  -0.1867E) A) and D)
F) A) and B)

Question 9

The proportion of the total area under a normal curve between two z-scores corresponds to the ______ of that range of scores.

Accepted Answer

A)  numeric magnitude
B)  variability
C)  frequency
D)  relative frequencyE) None of the above
F) B) and D)

Question 10

The absolute value of a number is the

Accepted Answer

A)  measure of how much the number is worth.
B)  size of a number only when it is a positive number.
C)  size of a number only when it is a negative number.
D)  size of a number,regardless of whether it is positive or negative.E) B) and C)
F) B) and D)

Question 11

The mean of a z-score distribution is always ______,and the standard deviation is always ______.

Accepted Answer

A)  0;10
B)  1;0
C)  100;20
D)  0;1E) A) and C)
F) A) and B)

Question 12

An evaluation of where a score is located in relation to the other scores in the distribution reflects its

Accepted Answer

A)  absolute value.
B)  relative standing.
C)  standard deviation.
D)  frequency.E) C) and D)
F) A) and C)

Question 13

If a school's z-score for its sample mean was +3,its percentile rank in the state was

Accepted Answer

A)  99.87%.
B)  90.87%.
C)  85.87%.
D)  95.87%.E) A) and B)
F) All of the above

Question 14

Sampling distributions of means are always

Accepted Answer

A)  approximately normally distributed.
B)  positively skewed.
C)  negatively skewed.
D)  more variable than the population from which the samples were drawn.E) None of the above
F) C) and D)

Question 15

If your sense of direction,relative to a sample of college students,gave you a z-score of +1.5,what is your percentile?

Accepted Answer

A)  6th
B)  7th
C)  43rd
D)  93rdE) B) and C)
F) A) and D)

Question 16

Given a normal distribution,as z-scores' absolute values increase,those z-scores and the raw scores that correspond to them occur

Accepted Answer

A)  more frequently.
B)  less frequently.
C)  more frequently at first and then less frequently.
D)  less frequently at first and then more frequently.E) C) and D)
F) B) and C)

Question 17

According to the central limit theorem,the sampling distribution of means always approximates a ______ distribution.

Accepted Answer

A)  normal
B)  positively skewed
C)  negatively skewed
D)  bimodalE) A) and D)
F) None of the above

Question 18

The sample mean for a recent introductory psychology test was 78 and the sample variance was 9.Approximately what proportion of the scores was above 81?

Accepted Answer

A)  0.50
B)  0.68
C)  0.16
D)  0.34E) A) and D)
F) A) and C)

Question 19

The sample mean for a recent introductory psychology test was 78,and the sample variance was 9.If a student received a score of 82,what was this student's z-score?

Accepted Answer

A)  0.44
B)  1.33
C)  -1.33
D)  -0.44E) A) and B)
F) None of the above

Question 20

The mean of the sampling distribution of means is always

Accepted Answer

A)  greater than the population mean.
B)  less than the population mean.
C)  equal to the population mean.
D)  the population mean divided by the square root of N.E) All of the above
F) B) and D)

Exam 6: Z-Scores and the Normal Curve

The mean of the sampling distribution of means is always

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Pat's last statistics test score was 72.If the instructor tells Pat that the grade distribution was approximately normal,the class mean was 67,and the standard deviation was 3,which of the following is correct?

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The sample mean for a recent introductory psychology test was 78,and the sample variance was 9.If a student received a score of 82,what was this student's z-score?

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What were the sample means that marked the middle 68% in the state if the population mean was 500 and the standard deviation (standard error) for the sampling distribution was 200?

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The proportion of the total area under a normal curve between two z-scores corresponds to the ______ of that range of scores.

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Which of the following is NOT a way we apply the standard normal curve?

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z-scores communicate a score's

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Sampling distributions of means are always

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Given a normal distribution,as z-scores' absolute values increase,those z-scores and the raw scores that correspond to them occur

Correct AnswerverifiedShow Answer

Using the appropriate values from the z-table in the textbook appendix,find the area above (beyond) z = +0.89.

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The mean of a z-score distribution is always ______,and the standard deviation is always ______.

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The absolute value of a number is the

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For a distribution with = 50 and = 5,find the raw scores for the following z-scores: -1.2;-0.5;1.7;2.6

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If your sense of direction,relative to a sample of college students,gave you a z-score of +1.5,what is your percentile?

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An evaluation of where a score is located in relation to the other scores in the distribution reflects its

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The size of depends on

Correct AnswerverifiedShow Answer

According to the central limit theorem,the sampling distribution of means always approximates a ______ distribution.

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Alicia scored a 70 on her psychology quiz,but the class as a whole averaged a 40.If the standard deviation was 10,what was Alicia's z-score?

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The sample mean for a recent introductory psychology test was 78 and the sample variance was 9.Approximately what proportion of the scores was above 81?

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If a school's z-score for its sample mean was +3,its percentile rank in the state was

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The mean of a z-score distribution is always ,and the standard deviation is always .

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