Question 1

The measure of dispersion that takes all of a variable's values into account is:

Accepted Answer

A) The range. 
B) The interquartile Range. 
C) The standard deviation. 
D) The mean. 
A) The range. 
B) The interquartile Range. 
C) The standard deviation. 
D) The mean. C

Question 2

Given the following values, the range is: 2, 2, 6, 10, 10

Accepted Answer

A) 2 
B) 4 
C) 9 
D) 10 
A) 2 
B) 4 
C) 9 
D) 10 C

Question 3

The square root of the variance is:

Accepted Answer

A) The range. 
B) The interquartile Range. 
C) The standard deviation. 
D) The mean. 
A) The range. 
B) The interquartile Range. 
C) The standard deviation. 
D) The mean. C

Question 4

Given the following values, the interquartile range is: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16

Accepted Answer

A) 5 - 13 
B) 4 - 13 
C) 4 -12 
D) 7 - 10 
A) 5 - 13 
B) 4 - 13 
C) 4 -12 
D) 7 - 10

Question 5

The range takes all of a variable's values into account.

Accepted Answer

A) True 
 B)False

Question 6

Which of the following statements is/are true about the boxplots?

Accepted Answer

A) They display the mean in the distribution of a variable. 
B) They provide a pictorial representation of the median, interquartile range, and range in the distribution of a variable. 
C) They fail to display outliers. 
D) They display the standard deviation in the distribution of a variable. 
A) They display the mean in the distribution of a variable. 
B) They provide a pictorial representation of the median, interquartile range, and range in the distribution of a variable. 
C) They fail to display outliers. 
D) They display the standard deviation in the distribution of a variable.

Question 7

The thick line in a boxplot represents the mode.

Accepted Answer

A) True 
 B)False

Question 8

The terms variability and dispersion both refer to the extent to which the values in a distribution are clustered near to each other or are scattered away from each other.

Accepted Answer

A) True 
 B)False

Question 9

The most commonly reported measure of dispersion is:

Accepted Answer

A) The range. 
B) The interquartile Range. 
C) The standard deviation. 
D) The mean. 
A) The range. 
B) The interquartile Range. 
C) The standard deviation. 
D) The mean.

Question 10

Given the following values, the standard deviation is: 2, 2, 6, 10, 10

Accepted Answer

A) 2 
B) 4 
C) 16 
D) 64 
A) 2 
B) 4 
C) 16 
D) 64

Question 11

Which of the following measures of dispersion is least influenced by extreme outliers?

Accepted Answer

A) Range. 
B) Interquartile Range. 
C) Standard deviation. 
D) Variance. 
A) Range. 
B) Interquartile Range. 
C) Standard deviation. 
D) Variance.

Question 12

The standard deviation in a distribution is the square root of that distribution's variance.

Accepted Answer

A) True 
 B)False

Question 13

Which of the following statements is/are true about the standard deviation?

Accepted Answer

A) It is the square root of the variance. 
B) It is the most commonly reported measure of dispersion. 
C) It takes all of a variable's values into account. 
D) All of these. 
A) It is the square root of the variance. 
B) It is the most commonly reported measure of dispersion. 
C) It takes all of a variable's values into account. 
D) All of these.

Question 14

Which of the following statements is/are true about the variance?

Accepted Answer

A) It is the square of the standard deviation. 
B) It is the average of the squared deviations from the mean. 
C) It takes all of a variable's values into account. 
D) All of these. 
A) It is the square of the standard deviation. 
B) It is the average of the squared deviations from the mean. 
C) It takes all of a variable's values into account. 
D) All of these.

Question 15

The interquartile range is the range for the middle 50 percent of values in a rank ordered distribution.

Accepted Answer

A) True 
 B)False

Question 16

Which of the following statements is true about the range?

Accepted Answer

A) It is unaffected by outliers. 
B) It can be misleading if it is inflated by one or more aberrant outliers. 
C) It provides more information than other measures of dispersion about the amount of variability in a distribution. 
D) It refers to the middle 75% of the values in a distribution. 
A) It is unaffected by outliers. 
B) It can be misleading if it is inflated by one or more aberrant outliers. 
C) It provides more information than other measures of dispersion about the amount of variability in a distribution. 
D) It refers to the middle 75% of the values in a distribution.

Question 17

Which of the following statements is true about the interquartile range?

Accepted Answer

A) It shows the middle quarter of values in a rank ordered distribution. 
B) It shows the range of values falling between the 50th and 75th percentiles. 
C) It has virtually no relevance to practitioners. 
D) It shows the range of values falling between the 25th and 75th percentiles. 
A) It shows the middle quarter of values in a rank ordered distribution. 
B) It shows the range of values falling between the 50th and 75th percentiles. 
C) It has virtually no relevance to practitioners. 
D) It shows the range of values falling between the 25th and 75th percentiles.

Question 18

Given the following values, the variance is: 1, 1, 5, 9, 9

Accepted Answer

A) 2 
B) 4 
C) 16 
D) 64 
A) 2 
B) 4 
C) 16 
D) 64

Question 19

The first step in calculating the variance is to subtract the mean from each value in a distribution.

Accepted Answer

A) True 
 B)False

Question 20

Measures of dispersion show:

Accepted Answer

A) How spread out data are. 
B) Where most data are located in a distribution. 
C) What values in a distribution are most important. 
D) What values in a distribution are least important. 
A) How spread out data are. 
B) Where most data are located in a distribution. 
C) What values in a distribution are most important. 
D) What values in a distribution are least important.

The measure of dispersion that takes all of a variable's values into account is:

Given the following values, the range is: 2, 2, 6, 10, 10

The square root of the variance is:

Given the following values, the interquartile range is: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16

The range takes all of a variable's values into account.

Which of the following statements is/are true about the boxplots?

The thick line in a boxplot represents the mode.

The terms variability and dispersion both refer to the extent to which the values in a distribution are clustered near to each other or are scattered away from each other.

The most commonly reported measure of dispersion is:

Given the following values, the standard deviation is: 2, 2, 6, 10, 10

Which of the following measures of dispersion is least influenced by extreme outliers?

The standard deviation in a distribution is the square root of that distribution's variance.

Which of the following statements is/are true about the standard deviation?

Which of the following statements is/are true about the variance?

The interquartile range is the range for the middle 50 percent of values in a rank ordered distribution.

Which of the following statements is true about the range?

Which of the following statements is true about the interquartile range?

Given the following values, the variance is: 1, 1, 5, 9, 9

The first step in calculating the variance is to subtract the mean from each value in a distribution.

Measures of dispersion show:

Why Study Statistics

Use of Statistics in Evidence-Based Practice

Review of Key Research Methodology Concepts and Terms

Frequency Distributions

Graphs and Charts

Measures of Central Tendency

Types of Distributions

Z-Scores, Percentiles and Effect Size

Probability and Sampling Distributions

Hypothesis Testing and Statistical Significance

Type I and Type Ii Errors

Interpreting the Strength and Importance of Relationships

The T-Test

Analysis of Variance

Cross Tabulation and Chi-Square

Correlation

Regression Analysis

Applications to Single-System Evaluation Designs

Filters

Exam 7: Measures of Dispersion

The measure of dispersion that takes all of a variable's values into account is:

Given the following values, the range is: 2, 2, 6, 10, 10

The square root of the variance is:

Given the following values, the interquartile range is: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16

The range takes all of a variable's values into account.

Which of the following statements is/are true about the boxplots?

The thick line in a boxplot represents the mode.

The terms variability and dispersion both refer to the extent to which the values in a distribution are clustered near to each other or are scattered away from each other.

The most commonly reported measure of dispersion is:

Given the following values, the standard deviation is: 2, 2, 6, 10, 10

Which of the following measures of dispersion is least influenced by extreme outliers?

The standard deviation in a distribution is the square root of that distribution's variance.

Which of the following statements is/are true about the standard deviation?

Which of the following statements is/are true about the variance?

The interquartile range is the range for the middle 50 percent of values in a rank ordered distribution.

Which of the following statements is true about the range?

Which of the following statements is true about the interquartile range?

Given the following values, the variance is: 1, 1, 5, 9, 9

The first step in calculating the variance is to subtract the mean from each value in a distribution.

Measures of dispersion show:

Why Study Statistics

Use of Statistics in Evidence-Based Practice

Review of Key Research Methodology Concepts and Terms

Frequency Distributions

Graphs and Charts

Measures of Central Tendency

Types of Distributions

Z-Scores, Percentiles and Effect Size

Probability and Sampling Distributions

Hypothesis Testing and Statistical Significance

Type I and Type Ii Errors

Interpreting the Strength and Importance of Relationships

The T-Test

Analysis of Variance

Cross Tabulation and Chi-Square

Correlation

Regression Analysis

Applications to Single-System Evaluation Designs

Filters