Question 17 0 / 1 point Once pairs of observations have been converted to differ

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Question 17       0 / 1 point
Once pairs of observations have been converted to difference scores, the t test for two related samples can be viewed as a
Question options:
    z test for a single sample.
    t test for a single sample.
    t test for two independent samples.
    t test for a population correlation coefficient.

Question 19       0 / 1 point
The t test for two related samples should be used if
Question options:
    subjects are matched.
    subjects are measured twice.
    either a or b
    sample sizes are equal.
Question 20       0 / 1 point
The dream times were measured for each of twenty volunteers during two sleep periods: once after an evening when no alcohol was consumed and once after an evening when alcohol was consumed.
To analyze the test results, use a t test for two related samples because
Question options:
    subjects are all young adults.   
    equal numbers of subjects participate in both periods.
    the same subject is measured twice.   
    each subject is monitored for rapid eye movement.

Question 22       0 / 1 point
The dream times for each of twenty volunteers are measured during two sleep periods: once after an evening when no alcohol was consumed and once after an evening when alcohol was consumed. It would be most important that subjects experience the two conditions in
Question options:
    the same order and on consecutive nights (before any alcohol effect disappears).
    the same order and on nonconsecutive nights (after any alcohol effect disappears).
    counterbalanced order and on consecutive nights (before any alcohol effect disappears).
    counterbalanced order and on nonconsecutive nights (after any alcohol effect disappears).

Question 25       0 / 1 point
If a sample correlation coefficient qualifies as a rare outcome under the null hypothesis, then you can conclude that the
Question options:
    sample correlation coefficient differs from zero.
    sample correlation coefficient could be zero.
    population correlation coefficient could be zero.
    population correlation coefficient differs from zero.

Explanation / Answer

Once pairs of observations have been converted to difference scores, the t test for two related samples can be viewed as a t test for a single sample.

The t test for two related samples should be used if either a or b

The dream times were measured for each of twenty volunteers during two sleep periods: once after an evening when no alcohol was consumed and once after an evening when alcohol was consumed.
To analyze the test results, use a t test for two related samples because the same subject is measured twice.

The dream times for each of twenty volunteers are measured during two sleep periods: once after an evening when no alcohol was consumed and once after an evening when alcohol was consumed. It would be most important that subjects experience the two conditions in counterbalanced order and on nonconsecutive nights (after any alcohol effect disappears).

If a sample correlation coefficient qualifies as a rare outcome under the null hypothesis, then you can conclude that the  population correlation coefficient could be zero.

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