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# Statistical Tests Between the Means of Different Groups MCQ

### Degrees of freedom is value which is different for different _____ tests, that approximates the sample size of number of individual cells in an experimental design.

Answer

Correct Answer: Statistics

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### Which of the following t-test results has the greatest chance of statistical significance?

Answer

Correct Answer: T(28) = 1.70

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### If the null hypothesis is NOT supported, then the t-test should be _____.

Answer

Correct Answer: Greater than ±1.00.

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### An independent-groups t-test _____.

Answer

Correct Answer: Compares sample means for two unrelated groups

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### As sample variance ______, the value of the t-test ______.

Answer

Correct Answer: Increases; decreases

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### T(14) = 3.35, one-tailed. Based on these results we ______.

Answer

Correct Answer: Reject Ho

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

Answer

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

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### In order to compute the t value, you must approximate the sample size by calculating the ______..

Answer

Correct Answer: Degrees of freedom

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### For an independent-groups t-test, effect size can be measured using _____.

Answer

Correct Answer: Either Cohen’s d or r2

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### If, after calculating an independent-groups t-test you find that it is equal to zero, then _____.

Answer

Correct Answer: The two-sample means do not differ significantly

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### In an independent groups t-test, we divide by _____.

Answer

Correct Answer: The standard error of the difference between means

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### If the null hypothesis is TRUE, then the t-test should be close to _____.

Answer

Correct Answer: 0.00.

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

Answer

Correct Answer: N

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### For an independent-groups t-test, the value of Cohen’s d describes _____.

Answer

Correct Answer: The size of the treatment effect

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### If an independent-groups t-test has 13 subjects in each group, then the degrees of freedom are _____.

Answer

Correct Answer: 24

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