Question

Match which type of test would be most appropriate for the given scenario.

-A.B.C. You are investigating whether there was a change in performance between a group’s pretest and posttest. -A.B.C. You are investigating whether ABC Elementary School performed significantly higher than XYZ Elementary School on a standardized test. -A.B.C. You are investigating whether the mean IQ of all college students is lower than the national average of 115.

A. Left (negative) tail B. Either (non-directional) tail C. Right (positive) tail

Answer 1

First

You are investigating whether there was a change in performance between a group’s pretest and posttest.

B.	Either (non-directional) tail

Performance can both improve and diminish between pretest and postest and therefore we perform either tail test.

Second

You are investigating whether ABC Elementary School performed significantly higher than XYZ Elementary School on a standardized test.

C.	Right (positive) tail

Since we need to test whether the performance improved or not i.e. whether the ABC Elementary School results are better than the XYZ Elementary School or not, we will use a right-tailed test.

Third

You are investigating whether the mean IQ of all college students is lower than the national average of 115.

A.	Left (negative) tail

Test if the mean IQ is lower than 115

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