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Statistical Tests Between the Means of Related Groups MCQ

1. Degrees of freedom (df) for the one-sample t-test is equal to _____.

N + 1

N - 1

1/N

Answer

Correct Answer: N.

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2. The number of scores in a sample that are free to vary represents ______.

The sample size

The degrees of freedom

None of these

Answer

Correct Answer: The degrees of freedom

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3. What happens to the t-distribution as the sample size increases?

The t-distribution appears less and less like a normal distribution.

The t-distribution appears more and more like a normal distribution.

The shape of the t-distribution is unaffected.

Becomes nearer to the true value of mu.

Answer

Correct Answer: The t-distribution appears more and more like a normal distribution.

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4. A parametric inferential statistical test of the null hypothesis for a single sample where the population variance is NOT known is the ______.

Z test

T test

Cohen’s d

Standard error of the mean

Answer

Correct Answer: T test

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5. If a researcher reports a one-sample t-test with df = 24, how many individuals participated in this study?

Cannot be determined from the information given

Answer

Correct Answer: 25

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6. The set of distributions that although symmetrical and bell-shaped, are NOT normally distributed is known as _____.

Student’s t distribution

Gosset’s t distribution

The z distribution

None of these

Answer

Correct Answer: Student’s t distribution

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7. If a researcher reported for a single-sample t-test that t(17) = 2.90, p< 0.02, how many subjects were there in the study?

Answer

Correct Answer: 18

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8. For a single-sample t test with 18 subjects, the degrees of freedom are _____.

Unable to be determined

Answer

Correct Answer: 17

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9. If the obtained value is greater than the critical value, what should be done?

Reject the null hypothesis

Set a higher p value

Accept the null hypothesis

Increase the sample size

Answer

Correct Answer: Reject the null hypothesis

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10. Which of the following is NOT an assumption of the t-test?

The data should be ordinal or nominal.

The population distribution of scores should be symmetrical.

The population mean (µ) is known, but the population standard deviation (σ) is not known.

The sample size is typically less than 30.

Answer

Correct Answer: The data should be ordinal or nominal.

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11. When computing the t value, the sample size must be approximated by calculating the ______.

Pooled variance

Mean score

Standard deviation

Degrees of freedom

Answer

Correct Answer: Degrees of freedom

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12. If a researcher reported for a one-tailed single-sample t-test that t(14) = 2.25, then _____.

P < 0.025

P < 0.05

P < 0.01

P < 0.001

Answer

Correct Answer: P < 0.025

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