For each example, state whether the one- sample, two-independent-sample, or rela

Question

For each example, state whether the one- sample, two-independent-sample, or related-samples t test is most appropriate. If it is a related-samples t test, indicate whether the test is a repeated-measures design or a matched-pairs design. A professor tests whether students sitting in the front row score higher on an exam than students sitting in the back row. A researcher matches right-handed and left-handed siblings to test whether right-handed siblings express greater emotional intelligence than left-handed siblings. A graduate student selects a sample of 25 participants to test whether the average time students attend to a task is greater than 30 minutes. A principal at a local school wants to know how much students gain from being in an honors class. He gives students in an honors English class a test prior to the school year and again at the end of the school year to measure how much students learned during the year.

Explanation / Answer

a)

Two-independent sample. [ANSWER]

There are no natural pairings for the scores at the back row and front row.

b)

Related-samples t test. It is a matched pairs design. [ANSWER]

Although they are related, they are not the same person, so it's not repeated measures.

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c)

One-sample t test.

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d)

Related-samples t test. It is a repeated measures design. [ANSWER]

It is a before and after measurement, so it is repeated measures of the same quantity.

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