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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.

Statistics

Physical

Chemical

Maths

Answer

Correct Answer: Statistics

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

T(28) = 1.70

T(14) = 1.70

T(18) = 1.70

T(10) = 1.70

Answer

Correct Answer: T(28) = 1.70

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

0.00.

±1.00.

Greater than ±1.00.

A negative number

Answer

Correct Answer: Greater than ±1.00.

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An independent-groups t-test _____.

Compares sample means for two related groups

Compares sample means for two unrelated groups

Compares standard deviations for two unrelated groups

Compares sample means for three or more unrelated groups

Answer

Correct Answer: Compares sample means for two unrelated groups

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

Increases; increases

Decreases; decreases

Increases; decreases

Increases; stays the same

Answer

Correct Answer: Increases; decreases

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

Reject Ho

Fail to reject Ho

Accept Ho

Reject Ha

Answer

Correct Answer: Reject Ho

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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 µ

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 ______..

Pooled variance

Degrees of freedom

Critical value

Directional hypothesis

Answer

Correct Answer: Degrees of freedom

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

Cohen’s d

The standard error of the difference between means

Either Cohen’s d or r2

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 _____.

The two-sample means differ significantly

The two-sample means do not differ significantly

You have done something wrong

The two population means differ significantly

Answer

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

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

The standard error of the mean

The estimated standard error of the mean

The standard deviation

The standard error of the difference between means

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 _____.

0.00.

±1.65.

±1.96.

±3.00.

Answer

Correct Answer: 0.00.

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

Df - 1

N - 1

N + 1

Answer

Correct Answer: N

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

The size of the treatment effect

The chance of a Type I error

The chance of a Type II error

The overall chance level in the experiment

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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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.

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

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

An independent-groups t-test _____.

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

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

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

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

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

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

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

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

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

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

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

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