Question 1

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.

Question 2

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

Accepted Answer

The range can be problematic as a measur...

Question 3

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.

Question 4

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.

Question 5

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

Accepted Answer

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

Question 6

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

Accepted Answer

A)   SS
B)   s
C)   σ²
D)   σ C

Question 7

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 ...

Question 8

What does (X - μ)  represent?

Accepted Answer

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

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.

Question 10

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

Question 11

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.

Question 12

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 13

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% C

Question 14

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.

Question 15

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

Question 16

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.

Question 17

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.

Question 18

The symbol σ represents

Accepted Answer

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

Question 19

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 20

Which symbol below does not belong?

Accepted Answer

A)   IQR
B)   σ
C)   μ
D)   R

Exam 4: Measures of Variability

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

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

Correct Answer
verified
The range can be problematic as a measur...
View Answer

Variability refers to

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

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

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

Correct Answer
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C

Correct Answer
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a. Population standard deviation
c. The ...
View Answer

What does (X - μ) represent?

Correct Answer
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B

In order to determine the interquartile range, we need

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

Correct Answer
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The interquartile range

Correct Answer
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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

Correct Answer
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a. SS = 50...
View Answer

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

Correct Answer
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C

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

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

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

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

Correct Answer
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The symbol σ represents

Correct Answer
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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.

Correct Answer
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a. R=12.5-4.5=8
b. 5...
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Which symbol below does not belong?

Correct Answer
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Exam 4: Measures of Variability

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedThe range can be problematic as a measur...View AnswerShow Answer

Variability refers to

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedC

Correct Answerverifieda. Population standard deviationc. The ...View AnswerShow Answer

What does (X - μ) represent?

Correct AnswerverifiedB

In order to determine the interquartile range, we need

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The interquartile range

Correct AnswerverifiedShow Answer

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

Correct Answerverifieda. SS = 50...View AnswerShow Answer

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

Correct AnswerverifiedC

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The symbol σ represents

Correct AnswerverifiedShow Answer

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.

Correct Answerverifieda. R=12.5-4.5=8b. 5...View AnswerShow Answer

Which symbol below does not belong?

Correct AnswerverifiedShow Answer

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The range can be problematic as a measur...
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C

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a. Population standard deviation
c. The ...
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B

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a. SS = 50...
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C

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