Question 1

What does (X - μ) represent?

Accepted Answer

A)  a standard deviation. 
B)  a deviation score. 
C)  SS. 
D)  the variance. 
A)  a standard deviation. 
B)  a deviation score. 
C)  SS. 
D)  the variance. B

Question 2

If we squared the standard deviation, the resulting value would give us _________.

Accepted Answer

A)  SS 
B)  s 
C)  σ² 
D)  σ 
A)  SS 
B)  s 
C)  σ² 
D)  σ C

Question 3

The point at or below which __________ of the scores lie is used in calculating the interquartile range.

Accepted Answer

A)  10% 
B)  50% 
C)  75% 
D)  90% 
A)  10% 
B)  50% 
C)  75% 
D)  90% C

Question 4

If we squared the standard deviation, the resulting value would be

Accepted Answer

A)  the interquartile range. 
B)  a deviation score. 
C)  sum of squares. 
D)  the variance. 
A)  the interquartile range. 
B)  a deviation score. 
C)  sum of squares. 
D)  the variance.

Question 5

The following set of scores are from a population: 5, 10, 12, 13, 6, 9. Using the computational formula, calculate
a. SS.
b. σ²
c. σ

Accepted Answer

a. SS = 50

Question 6

Variability refers to

Accepted Answer

A)  the most frequently occurring score in a distribution. 
B)  the most representative score in a distribution. 
C)  the amount of error in a distribution of scores. 
D)  the degree of similarity or difference in a set of scores. 
A)  the most frequently occurring score in a distribution. 
B)  the most representative score in a distribution. 
C)  the amount of error in a distribution of scores. 
D)  the degree of similarity or difference in a set of scores.

Question 7

Why is the range sometimes problematic as a measure of variability?

Accepted Answer

The range can be problematic as a measur

Question 8

A set of scores from a population has a mean equal to 36. What is the deviation score for someone who scored 40?

Accepted Answer

A)  4 
B)  -4 
C)  0 
D)  40 
A)  4 
B)  -4 
C)  0 
D)  40

Question 9

In order to determine the interquartile range, we need

Accepted Answer

A)  Q₃ and Q₄. 
B)  Q₁ and Q₄. 
C)  Q₁ and Q₃. 
D)  Q₂ and Q₄. 
A)  Q₃ and Q₄. 
B)  Q₁ and Q₄. 
C)  Q₁ and Q₃. 
D)  Q₂ and Q₄.

Question 10

For the following set of scores: 6, 12, 9, 8, 12, 7, 6, 8, 5, 12, 8, 7
a. determine the range.
b. determine the interquartile range.

Accepted Answer

a. R=12.5-4.5=8
b. 5

Question 11

A set of 10 scores has a standard deviation of 4. What is the variance?

Accepted Answer

A)  1.6 
B)  2.5 
C)  40 
D)  16 
A)  1.6 
B)  2.5 
C)  40 
D)  16

Question 12

What is the preferred measure of variability for distributions that are skewed?

Accepted Answer

A)  median 
B)  standard deviation 
C)  range 
D)  interquartile range 
A)  median 
B)  standard deviation 
C)  range 
D)  interquartile range

Question 13

The symbol σ represents

Accepted Answer

A)  the sample mean. 
B)  the population mean. 
C)  the sample standard deviation. 
D)  the population standard deviation. 
A)  the sample mean. 
B)  the population mean. 
C)  the sample standard deviation. 
D)  the population standard deviation.

Question 14

The range can be problematic as a measure of variability because it

Accepted Answer

A)  only considers scores in the middle 50% of the distribution. 
B)  only considers the most extreme scores in the distribution. 
C)  only considers the high scores in the distribution. 
D)  only considers the low scores in the distribution. 
A)  only considers scores in the middle 50% of the distribution. 
B)  only considers the most extreme scores in the distribution. 
C)  only considers the high scores in the distribution. 
D)  only considers the low scores in the distribution.

Question 15

An advantage of the interquartile range as a measure of variability is that it

Accepted Answer

A)  is not sensitive to extreme scores. 
B)  takes all score values into consideration. 
C)  only considers the highest and lowest scores in the distribution. 
D)  is not influenced by the middle scores in the distribution. 
A)  is not sensitive to extreme scores. 
B)  takes all score values into consideration. 
C)  only considers the highest and lowest scores in the distribution. 
D)  is not influenced by the middle scores in the distribution.

Question 16

Which measure of variability provides the best description of the middle 50% of the distribution?

Accepted Answer

A)  the range. 
B)  the interquartile range. 
C)  the variance. 
D)  the standard deviation. 
A)  the range. 
B)  the interquartile range. 
C)  the variance. 
D)  the standard deviation.

Question 17

If the standard deviation of a test was σ = 0, this would mean that

Accepted Answer

A)  everyone got the same score. 
B)  everyone scored very low on the test. 
C)  everyone scored very high on the test. 
D)  This result is not possible. 
A)  everyone got the same score. 
B)  everyone scored very low on the test. 
C)  everyone scored very high on the test. 
D)  This result is not possible.

Question 18

The interquartile range

Accepted Answer

A)  is determined by considering the extreme scores in a distribution. 
B)  describes the range of scores from the middle 50% of the distribution. 
C)  only considers the high scores in a distribution. 
D)  only considers the low scores in a distribution. 
A)  is determined by considering the extreme scores in a distribution. 
B)  describes the range of scores from the middle 50% of the distribution. 
C)  only considers the high scores in a distribution. 
D)  only considers the low scores in a distribution.

Question 19

Which symbol below does not belong?

Accepted Answer

A)  IQR 
B)  σ 
C)  μ 
D)  R 
A)  IQR 
B)  σ 
C)  μ 
D)  R

Question 20

The scores from a population are as follows: 58, 41, 75, 38, 47, 56, 41, 36, 55, 39.
a. Calculate the population standard deviation.
b. Assume that you randomly drew the scores 38, 55, and 41 from that population. Calculate the sample standard deviation using the sample scores.
c. Why is the sample standard deviation usually smaller than the population standard deviation?
d. What can be done to compensate for the underestimation of the sample standard deviation?

Accepted Answer

a. Population standard deviation
c. The

What does (X - μ) represent?

If we squared the standard deviation, the resulting value would give us _________.

The point at or below which __________ of the scores lie is used in calculating the interquartile range.

If we squared the standard deviation, the resulting value would be

The following set of scores are from a population: 5, 10, 12, 13, 6, 9. Using the computational formula, calculate a. SS. b. σ² c. σ

Variability refers to

Why is the range sometimes problematic as a measure of variability?

A set of scores from a population has a mean equal to 36. What is the deviation score for someone who scored 40?

In order to determine the interquartile range, we need

For the following set of scores: 6, 12, 9, 8, 12, 7, 6, 8, 5, 12, 8, 7 a. determine the range. b. determine the interquartile range.

A set of 10 scores has a standard deviation of 4. What is the variance?

What is the preferred measure of variability for distributions that are skewed?

The symbol σ represents

The range can be problematic as a measure of variability because it

An advantage of the interquartile range as a measure of variability is that it

Which measure of variability provides the best description of the middle 50% of the distribution?

If the standard deviation of a test was σ = 0, this would mean that

The interquartile range

Which symbol below does not belong?

Organizing Data Using Tables and Graphs

Measures of Central Tendency

Z-Scores and Other Standard Scores

Probability and the Normal Distribution

Sampling Distribution of Means

Hypothesis Testing

One-Sample T-Test

Two-Sample T-Test: Independent Samples Design

Two-Sample T-Test: Related Samples Design

Confidence Interval Versus Point Estimation

One-Way Analysis of Variance

Factorial Analysis of Variance

Correlation and Regression

Chi-Square

Introduction to Statistics

Nonparametric Statistics for Ordinal Data

Filters

Exam 4: Measures of Variability

What does (X - μ) represent?

If we squared the standard deviation, the resulting value would give us _________.

The point at or below which __________ of the scores lie is used in calculating the interquartile range.

If we squared the standard deviation, the resulting value would be

The following set of scores are from a population: 5, 10, 12, 13, 6, 9. Using the computational formula, calculate a. SS. b. σ² c. σ

Variability refers to

Why is the range sometimes problematic as a measure of variability?

A set of scores from a population has a mean equal to 36. What is the deviation score for someone who scored 40?

In order to determine the interquartile range, we need

For the following set of scores: 6, 12, 9, 8, 12, 7, 6, 8, 5, 12, 8, 7 a. determine the range. b. determine the interquartile range.

A set of 10 scores has a standard deviation of 4. What is the variance?

What is the preferred measure of variability for distributions that are skewed?

The symbol σ represents

The range can be problematic as a measure of variability because it

An advantage of the interquartile range as a measure of variability is that it

Which measure of variability provides the best description of the middle 50% of the distribution?

If the standard deviation of a test was σ = 0, this would mean that

The interquartile range

Which symbol below does not belong?

Organizing Data Using Tables and Graphs

Measures of Central Tendency

Z-Scores and Other Standard Scores

Probability and the Normal Distribution

Sampling Distribution of Means

Hypothesis Testing

One-Sample T-Test

Two-Sample T-Test: Independent Samples Design

Two-Sample T-Test: Related Samples Design

Confidence Interval Versus Point Estimation

One-Way Analysis of Variance

Factorial Analysis of Variance

Correlation and Regression

Chi-Square

Introduction to Statistics

Nonparametric Statistics for Ordinal Data

Filters