a ) The final step in conducting the single-sample t test is: Select one: A. ide

Question

a )

The final step in conducting the single-sample t test is:

Select one:

A. identify the characteristics of the comparison distribution.

B. determining the critical values.

C. calculating the test statistic.

D. making a decision.

b)Why do we divide by N – 1 rather than by N when estimating a population standard deviation from the sample standard deviation?

Select one:

A. Because the sample standard deviation is likely to be an imprecise estimate, we allow the error of the estimate (the standard deviation) to be larger by dividing the sum of squares by a smaller number.

B. The sample standard deviation is a superior estimate of the variability in the population than is the population standard deviation.

C. We typically have to throw out at least one data point in any given study, so the N – 1 allows us to account for that.

D. None of these statements accurately describes why we divide by N – 1 rather than by N.

c)The correct formula for effect size using Cohen's d for a paired-samples t test is:

Select one:

A. d = (M – )/s.

B. d = ( – )/s.

C. d = (M – )/s + .

D. d = (X – )/s.

d)The numerator (top portion) of the ratio for calculating all the t statistics contains:

Select one:

A. a variance estimate.

B. the degrees of freedom.

C. the sample mean.

D. a difference between means.

e)A paired-samples test is reported as t(30) = 2.23. Make a decision about this test, assuming a two-tailed hypothesis test with a p level of 0.05.

Select one:

A. Reject the research hypothesis.

B. Fail to reject the null hypothesis.

C. Reject the null hypothesis.

D. Fail to reject the research hypothesis.

f)The formula “H0: 1 = 2” is used to represent the:

Select one:

A. null hypothesis.

B. research hypothesis.

C. standard error.

D. alternative hypothesis.

Explanation / Answer

a)  making a decision. Option D is Correct

b) Because the sample standard deviation is likely to be an imprecise estimate, we allow the error of the estimate (the standard deviation) to be larger by dividing the sum of squares by a smaller number. Option A is Correct

c) d = (X – )/s.Option D is Correct

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