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The range is the descriptive statistic that indicates the


A) distance from the median.
B) distance between the two most extreme scores.
C) variability among means.
D) distance between the mean and the extreme scores.

E) A) and B)
F) All of the above

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A program evaluator for a large school district wants to study intelligence in the elementary schools.She randomly selects one classroom at each grade level in each elementary school and administers an intelligence test to the children in those classrooms.In order to find out which school has the most consistent intelligence level,which of the following should she calculate for each school?


A) The mean
B) The standard deviation
C) The median
D) The range

E) A) and B)
F) A) and C)

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The proper way to describe errors of prediction is to compute


A) the variance.
B) the range.
C) a z-score.
D) a T-score.

E) A) and D)
F) B) and D)

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If we add If we add to <sub> </sub>and subtract from ,the interval we have created A) encompasses approximately 34% of the scores in the sample. B) encompasses approximately 68% of the scores in the sample. C) is approximately 68% of the range. D) is approximately 68% of the semi-interquartile range. to If we add to <sub> </sub>and subtract from ,the interval we have created A) encompasses approximately 34% of the scores in the sample. B) encompasses approximately 68% of the scores in the sample. C) is approximately 68% of the range. D) is approximately 68% of the semi-interquartile range. and subtract If we add to <sub> </sub>and subtract from ,the interval we have created A) encompasses approximately 34% of the scores in the sample. B) encompasses approximately 68% of the scores in the sample. C) is approximately 68% of the range. D) is approximately 68% of the semi-interquartile range. from If we add to <sub> </sub>and subtract from ,the interval we have created A) encompasses approximately 34% of the scores in the sample. B) encompasses approximately 68% of the scores in the sample. C) is approximately 68% of the range. D) is approximately 68% of the semi-interquartile range. ,the interval we have created


A) encompasses approximately 34% of the scores in the sample.
B) encompasses approximately 68% of the scores in the sample.
C) is approximately 68% of the range.
D) is approximately 68% of the semi-interquartile range.

E) B) and C)
F) All of the above

Correct Answer

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The quantity N 1 has a special name.It is known as the


A) unbiased estimate.
B) biased estimate.
C) degrees of freedom.
D) freedom of variation.

E) A) and B)
F) A) and C)

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If a sample has a small standard deviation,we can say that the scores in the sample are


A) variable.
B) small.
C) extreme.
D) consistent.

E) A) and B)
F) A) and C)

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A psychology professor wanted to describe his/her class in terms of the personality characteristic of introversion/extroversion.The population variance was estimated to be 2.56.What does this mean?


A) When the professor uses the population mean to predict individuals' scores,he/she should expect to be in error by about 2.56.
B) When the professor uses the population mean to predict individuals' scores,he/she should expect to be more accurate by about 2.56.
C) It is impossible to tell because the mean is not known.
D) The sample mean differs from the population mean by about 2.56.

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

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If the sample standard deviation If the sample standard deviation for a set of data with N = 6 is found to be 3.17,then what is the sample variance ? A) 3.47 B) 1.78 C) 12.06 D) 10.05 for a set of data with N = 6 is found to be 3.17,then what is the sample variance If the sample standard deviation for a set of data with N = 6 is found to be 3.17,then what is the sample variance ? A) 3.47 B) 1.78 C) 12.06 D) 10.05 ?


A) 3.47
B) 1.78
C) 12.06
D) 10.05

E) C) and D)
F) All of the above

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Adding a constant to or subtracting a constant from each of the scores in a distribution


A) changes the value of the standard deviation by the amount of the constant.
B) changes the value of the standard deviation by half the amount of the constant.
C) changes the value of the standard deviation by 34% of the amount of the constant.
D) does not change the value of the standard deviation.

E) B) and C)
F) All of the above

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If the variance for a sample is computed and it is found to be rather large,the numbers


A) are tightly packed around the mode.
B) are tightly packed around the mean.
C) are spread out around the mean.
D) in the sample are close to one another.

E) None of the above
F) All of the above

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For the following data set,calculate the sample variance. 1.72,4.01,2.55,0.67,1.93,2.05,2.69,3.13,1.22,3.84


A) 1.0243
B) 1.0492
C) 1.0797
D) 1.1659

E) A) and B)
F) A) and C)

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What do What do , ,and have in common? A) All are forms of standardized variance. B) All are forms of standard deviation. C) All are forms of variance. D) All represent the location of a set of scores. , What do , ,and have in common? A) All are forms of standardized variance. B) All are forms of standard deviation. C) All are forms of variance. D) All represent the location of a set of scores. ,and What do , ,and have in common? A) All are forms of standardized variance. B) All are forms of standard deviation. C) All are forms of variance. D) All represent the location of a set of scores. have in common?


A) All are forms of standardized variance.
B) All are forms of standard deviation.
C) All are forms of variance.
D) All represent the location of a set of scores.

E) A) and D)
F) B) and D)

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Unbiased estimators Unbiased estimators and of the population parameters will produce values that are _____ those produced by the biased estimators and . A) smaller than B) larger than C) the same as D) sometimes larger than and sometimes smaller than and Unbiased estimators and of the population parameters will produce values that are _____ those produced by the biased estimators and . A) smaller than B) larger than C) the same as D) sometimes larger than and sometimes smaller than of the population parameters will produce values that are _____ those produced by the biased estimators Unbiased estimators and of the population parameters will produce values that are _____ those produced by the biased estimators and . A) smaller than B) larger than C) the same as D) sometimes larger than and sometimes smaller than and Unbiased estimators and of the population parameters will produce values that are _____ those produced by the biased estimators and . A) smaller than B) larger than C) the same as D) sometimes larger than and sometimes smaller than .


A) smaller than
B) larger than
C) the same as
D) sometimes larger than and sometimes smaller than

E) A) and B)
F) A) and C)

Correct Answer

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The greater the variability in a set of scores,


A) the less accurately the scores are represented by the mean.
B) the more accurately the scores are represented by the mean.
C) the more similar and consistently close they are to the mean.
D) the less similar and more consistently close they are to the mean.

E) A) and B)
F) None of the above

Correct Answer

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is the symbol for A) population variance. B) sample variance. C) population standard deviation. D) sample standard deviation. is the symbol for


A) population variance.
B) sample variance.
C) population standard deviation.
D) sample standard deviation.

E) B) and D)
F) None of the above

Correct Answer

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For the following data set,calculate the sample standard deviation. 1.72,4.01,2.55,0.67,1.93,2.05,2.69,3.13,1.22,3.84


A) 1.0243
B) 1.0492
C) 1.0797
D) 1.1659

E) A) and B)
F) None of the above

Correct Answer

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What is the estimated population standard deviation What is the estimated population standard deviation of the following data? A) 1.83 B) 3.36 C) 3.16 D) 1.78 of the following data? What is the estimated population standard deviation of the following data? A) 1.83 B) 3.36 C) 3.16 D) 1.78


A) 1.83
B) 3.36
C) 3.16
D) 1.78

E) A) and B)
F) A) and C)

Correct Answer

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The variance and standard deviation indicate how much the scores are spread out around


A) the range.
B) the mean.
C) the median.
D) the deviation.

E) B) and D)
F) None of the above

Correct Answer

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What is the range of the following data? What is the range of the following data? A) 3 B) 5 C) 6 D) 9


A) 3
B) 5
C) 6
D) 9

E) A) and D)
F) A) and C)

Correct Answer

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Which of the following studies shows the strongest relationship between the independent and dependent variables? Which of the following studies shows the strongest relationship between the independent and dependent variables? A) Study A B) Study B C) Study C D) Study D


A) Study A
B) Study B
C) Study C
D) Study D

E) C) and D)
F) None of the above

Correct Answer

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