Question 1

As the magnitude of a correlation coefficient increases, the

Accepted Answer

A)  data points in a scatter diagram become more dispersed. 
B)  data points in a scatter diagram become less dispersed. 
C)  correlation coefficient changes from a positive to a negative number. 
D)  correlation coefficient changes from a negative to a positive number. 
A)  data points in a scatter diagram become more dispersed. 
B)  data points in a scatter diagram become less dispersed. 
C)  correlation coefficient changes from a positive to a negative number. 
D)  correlation coefficient changes from a negative to a positive number.

Question 2

Which of the following statements BEST describes a skewed distribution?

Accepted Answer

A)  the distribution is symmetrical or balanced 
B)  the distribution is not symmetrical or balanced 
C)  many scores in the distribution are high 
D)  many scores in the distribution are low 
A)  the distribution is symmetrical or balanced 
B)  the distribution is not symmetrical or balanced 
C)  many scores in the distribution are high 
D)  many scores in the distribution are low

Question 3

In the formula for the standard deviation, the symbol S stands for

Accepted Answer

A)  summation. 
B)  sum of the squares. 
C)  deviation from the mean. 
D)  deviation from the normal distribution. 
A)  summation. 
B)  sum of the squares. 
C)  deviation from the mean. 
D)  deviation from the normal distribution.

Question 4

Manuela has collected data on the relationship between the number of hours the number of days the employees at a large number of factories call in sick and the productivity of the factories. She finds that the correlation is about negative .75. A scatter diagram of Manuela's data would show the data

Accepted Answer

A)  on a perfectly straight line from the bottom left corner to the top right corner. 
B)  clustering near a line running from the bottom left corner to the top right corner. 
C)  on a perfectly straight line from the bottom right corner to the top left corner. 
D)  clustering near a line running from the bottom right corner to the top left corner. 
A)  on a perfectly straight line from the bottom left corner to the top right corner. 
B)  clustering near a line running from the bottom left corner to the top right corner. 
C)  on a perfectly straight line from the bottom right corner to the top left corner. 
D)  clustering near a line running from the bottom right corner to the top left corner.

Question 5

When scores are "bunched up" in the center of a distribution, the

Accepted Answer

A)  mean will be relatively low. 
B)  standard deviation will be relatively low. 
C)  correlation coefficient will be a negative number. 
D)  standard deviation will be relatively high. 
A)  mean will be relatively low. 
B)  standard deviation will be relatively low. 
C)  correlation coefficient will be a negative number. 
D)  standard deviation will be relatively high.

Question 6

The median is determined by

Accepted Answer

A)  arranging the scores in increasing order and finding the middle score. 
B)  finding the most frequently occurring score. 
C)  adding up all the scores and dividing by the number of scores. 
D)  dividing the middle score by the number of scores. 
A)  arranging the scores in increasing order and finding the middle score. 
B)  finding the most frequently occurring score. 
C)  adding up all the scores and dividing by the number of scores. 
D)  dividing the middle score by the number of scores.

Question 7

The percentage of variation in one variable that can be predicted based on the other variable is known as the

Accepted Answer

A)  coefficient of determination. 
B)  standard deviation. 
C)  correlation coefficient. 
D)  mean. 
A)  coefficient of determination. 
B)  standard deviation. 
C)  correlation coefficient. 
D)  mean.

Question 8

Histograms and frequency polygons typically list possible scores on the ____ and indicate frequency of the scores on the ____.

Accepted Answer

A)  horizontal axis; vertical axis 
B)  vertical axis; horizontal axis 
C)  left side; right side 
D)  right side; left side 
A)  horizontal axis; vertical axis 
B)  vertical axis; horizontal axis 
C)  left side; right side 
D)  right side; left side

Question 9

High scores on variable X are associated with high scores on variable Y, and low scores on variable X are associated with low scores on variable Y. Hence, the correlation between variables X and Y will be

Accepted Answer

A)  negative. 
B)  positive. 
C)  zero. 
D)  spurious. 
A)  negative. 
B)  positive. 
C)  zero. 
D)  spurious.

Question 10

The use of mathematics to organize, summarize and interpret numerical data is known as

Accepted Answer

A)  statistical significance. 
B)  standard deviation. 
C)  statistics. 
D)  variability. 
A)  statistical significance. 
B)  standard deviation. 
C)  statistics. 
D)  variability.

Question 11

When a frequency polygon has a sharp peak near the center, and very few scores away from the center, you would expect that

Accepted Answer

A)  the mode for the data set will be greater than the mean. 
B)  the standard deviation for the data set will be high. 
C)  the standard deviation for the data set will be low. 
D)  the mean for the data set will be less than the median. 
A)  the mode for the data set will be greater than the mean. 
B)  the standard deviation for the data set will be high. 
C)  the standard deviation for the data set will be low. 
D)  the mean for the data set will be less than the median.

Question 12

If two variables are correlated, the percentage of variation in one variable that can be predicted from the other variable

Accepted Answer

A)  increases for positive correlations and decreases for negative correlations. 
B)  increases for negative correlations and decreases for positive correlations. 
C)  increases as the magnitude of the correlation coefficient increases. 
D)  decreases as the magnitude of the correlation coefficient increases. 
A)  increases for positive correlations and decreases for negative correlations. 
B)  increases for negative correlations and decreases for positive correlations. 
C)  increases as the magnitude of the correlation coefficient increases. 
D)  decreases as the magnitude of the correlation coefficient increases.

Question 13

Multiplying a correlation coefficient by itself will give you the

Accepted Answer

A)  standard deviation. 
B)  coefficient of determination. 
C)  percentile rank. 
D)  cross-product of the sum of squares. 
A)  standard deviation. 
B)  coefficient of determination. 
C)  percentile rank. 
D)  cross-product of the sum of squares.

Question 14

The use of statistics to organize and summarize data BEST describes the purpose of

Accepted Answer

A)  normal statistics 
B)  correlational statistics 
C)  inferential statistics 
D)  descriptive statistics 
A)  normal statistics 
B)  correlational statistics 
C)  inferential statistics 
D)  descriptive statistics

Question 15

An index of the amount of variability that exists in a distribution of scores is the

Accepted Answer

A)  central tendency. 
B)  standard deviation. 
C)  frequency distribution. 
D)  correlation coefficient. 
A)  central tendency. 
B)  standard deviation. 
C)  frequency distribution. 
D)  correlation coefficient.

Question 16

Frank scored 30 on a test of assertiveness. Assuming that assertiveness is normally distributed with a mean of 20 and a standard deviation of 5, what percentage of people are less assertive than Frank?

Accepted Answer

A)  50 percent 
B)  68.5 percent 
C)  95.5 percent 
D)  97.5 percent 
A)  50 percent 
B)  68.5 percent 
C)  95.5 percent 
D)  97.5 percent

Question 17

Dr. Kleiman gives an exam where most of the students receive failing grades and only a few students receive high scores. When the exam scores are plotted, the distribution will be

Accepted Answer

A)  positively skewed. 
B)  negatively skewed. 
C)  symmetrical. 
D)  impossible to predict without more information. 
A)  positively skewed. 
B)  negatively skewed. 
C)  symmetrical. 
D)  impossible to predict without more information.

Question 18

The index of the amount of variability in a set of data is known as the

Accepted Answer

A)  mean. 
B)  standard deviation. 
C)  median. 
D)  frequency distribution. 
A)  mean. 
B)  standard deviation. 
C)  median. 
D)  frequency distribution.

Question 19

In both bar graphs and frequency polygons, the horizontal axis is typically used to indicate

Accepted Answer

A)  all the possible scores in a data set. 
B)  the frequency of each score in a data set. 
C)  the average scores for the entire data set. 
D)  the strength of the correlation among the scores in a data set. 
A)  all the possible scores in a data set. 
B)  the frequency of each score in a data set. 
C)  the average scores for the entire data set. 
D)  the strength of the correlation among the scores in a data set.

Question 20

The standard deviation

Accepted Answer

A)  indicates the average difference between each score in a group and the mean for that group of scores. 
B)  reveals the degree of skew for a group of scores. 
C)  is sensitive to scores at the extremes of a distribution of scores. 
D)  is used to determine whether a data set is positively or negatively skewed. 
A)  indicates the average difference between each score in a group and the mean for that group of scores. 
B)  reveals the degree of skew for a group of scores. 
C)  is sensitive to scores at the extremes of a distribution of scores. 
D)  is used to determine whether a data set is positively or negatively skewed.

Exam 35: Statistical Methods

As the magnitude of a correlation coefficient increases, the

Which of the following statements BEST describes a skewed distribution?

In the formula for the standard deviation, the symbol S stands for

When scores are "bunched up" in the center of a distribution, the

The median is determined by

The percentage of variation in one variable that can be predicted based on the other variable is known as the

Histograms and frequency polygons typically list possible scores on the ____ and indicate frequency of the scores on the ____.

High scores on variable X are associated with high scores on variable Y, and low scores on variable X are associated with low scores on variable Y. Hence, the correlation between variables X and Y will be

The use of mathematics to organize, summarize and interpret numerical data is known as

When a frequency polygon has a sharp peak near the center, and very few scores away from the center, you would expect that

If two variables are correlated, the percentage of variation in one variable that can be predicted from the other variable

Multiplying a correlation coefficient by itself will give you the

The use of statistics to organize and summarize data BEST describes the purpose of

An index of the amount of variability that exists in a distribution of scores is the

Frank scored 30 on a test of assertiveness. Assuming that assertiveness is normally distributed with a mean of 20 and a standard deviation of 5, what percentage of people are less assertive than Frank?

Dr. Kleiman gives an exam where most of the students receive failing grades and only a few students receive high scores. When the exam scores are plotted, the distribution will be

The index of the amount of variability in a set of data is known as the

In both bar graphs and frequency polygons, the horizontal axis is typically used to indicate

The standard deviation

The Evolution of Psychology Part 1

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The Research Enterprise in Psychology Part 1

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Sensation and Perception Part 1

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Human Memory Part 1

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Language and Thought Part 1

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Personality: Theory, Research, and Assessment Part 1

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Histograms and frequency polygons typically list possible scores on the and indicate frequency of the scores on the .