Cohen's Standards for Small, Medium, and Large Effect Sizes Quiz
The question sheet
Reveal any answer as you study-
Cohen's d measures the relative strength of the differences between what?
- The variances of two samples
- The medians of two groups
- The sizes of two samples
- The means of two populations
Reveal answer
Answer: The means of two populations
Source evidence
PDF page 435: Cohen's d is a measure of "effect size" based on the differences between two means. Cohen’s d, named for United States statistician Jacob Cohen, measures the relative strength of the differences between the means of two populations based on sample data. The calculated value of effect size is then compared to Cohen’s standards of small, medium, and large effect sizes.
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Cohen's d is named for a statistician from which country?
- France
- United States
- Germany
- United Kingdom
Reveal answer
Answer: United States
Source evidence
PDF page 435: Cohen's d is a measure of "effect size" based on the differences between two means. Cohen’s d, named for United States statistician Jacob Cohen, measures the relative strength of the differences between the means of two populations based on sample data. The calculated value of effect size is then compared to Cohen’s standards of small, medium, and large effect sizes.
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According to Cohen's standards, what value indicates a small effect size?
- 0.8
- 0.5
- 0.2
- 1.0
Reveal answer
Answer: 0.2
Source evidence
PDF page 435: Size of effect d Small 0.2 medium 0.5 Large 0.8
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What does Cohen's d NOT provide, unlike other tests of hypothesis?
- A measure of effect
- A pooled value
- A difference of means
- A level of confidence
Reveal answer
Answer: A level of confidence
Source evidence
PDF page 435: 1 2 It is important to note that Cohen's d does not provide a level of confidence as to the magnitude of the size of the effect comparable to the other tests of hypothesis we have studied. The sizes of the effects are simply indicative.
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According to the evidence, the sizes of the effects from Cohen's d are simply what?
- Confirmed
- Indicative
- Certain
- Definitive
Reveal answer
Answer: Indicative
Source evidence
PDF page 435: 1 2 It is important to note that Cohen's d does not provide a level of confidence as to the magnitude of the size of the effect comparable to the other tests of hypothesis we have studied. The sizes of the effects are simply indicative.
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In the sample problem, a calculated Cohen's d of 0.384 indicates what effect size?
- Large
- Medium
- No effect
- Small
Reveal answer
Answer: Small
Source evidence
PDF page 436: The effect is small because 0.384 is between Cohen’s value of 0.2 for small effect size and 0.5 for medium effect size. The size of the differences of the means for the two companies is small indicating that there is not a significant difference between them.
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A Cohen's d of 0.384 falls between which two Cohen's values?
- 0.2 and 0.5
- 0.5 and 0.8
- 0.0 and 0.2
- 0.8 and 1.0
Reveal answer
Answer: 0.2 and 0.5
Source evidence
PDF page 436: The effect is small because 0.384 is between Cohen’s value of 0.2 for small effect size and 0.5 for medium effect size. The size of the differences of the means for the two companies is small indicating that there is not a significant difference between them.
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A small effect size in the sample problem indicates what about the two means?
- A large difference
- A reversed difference
- Not a significant difference
- No possible difference
Reveal answer
Answer: Not a significant difference
Source evidence
PDF page 436: The effect is small because 0.384 is between Cohen’s value of 0.2 for small effect size and 0.5 for medium effect size. The size of the differences of the means for the two companies is small indicating that there is not a significant difference between them.
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In the sample data, what is the mean of the first group?
- 1.5
- 11
- 4
- 3.5
Reveal answer
Answer: 4
Source evidence
PDF page 436: x̅1 = 4 s1 = 1.5 n1 = 11
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In the sample data, what is the standard deviation of the second group?
- 9
- 1.5
- 3.5
- 1
Reveal answer
Answer: 1
Source evidence
PDF page 436: x̅2 = 3.5 s2 = 1 n2 = 9
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The calculated value of effect size is compared to what?
- The sample range
- The z-scores
- Cohen's standards
- The population variance
Reveal answer
Answer: Cohen's standards
Source evidence
PDF page 435: Cohen's d is a measure of "effect size" based on the differences between two means. Cohen’s d, named for United States statistician Jacob Cohen, measures the relative strength of the differences between the means of two populations based on sample data. The calculated value of effect size is then compared to Cohen’s standards of small, medium, and large effect sizes.
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Cohen's d is based on differences derived from what kind of data?
- Census data
- Theoretical data
- Sample data
- Predicted data
Reveal answer
Answer: Sample data
Source evidence
PDF page 435: Cohen's d is a measure of "effect size" based on the differences between two means. Cohen’s d, named for United States statistician Jacob Cohen, measures the relative strength of the differences between the means of two populations based on sample data. The calculated value of effect size is then compared to Cohen’s standards of small, medium, and large effect sizes.
Introductory Business Statistics
Introductory Business Statistics by OpenStax, used under CC BY 4.0. Changes made by Stratacademy.
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