For which of the following situations is the independent groups t-test appropria

Question

For which of the following situations is the independent groups t-test appropriate (if inappropriate, why?):

a.         The independent variable is infant birth weight at one week (normal vs high); the dependent variable is resting heart rate.

b.         The independent variable is radiation treatment on throat cancer patients (after a low dose and then a high dose treatment); the dependent variable is white blood cell count.

c.         The IV is infant birth weight (low vs normal vs high); the DV is number of days absent from school in first grade.

d.         The IV is gender (male vs female); the DV is compliance vs noncompliance with a medication regimen.

e.         The independent variable is married status (single vs married); the dependent variable is happiness measured on a scale from 1 to 50

Explanation / Answer

(a)The independent variable is infant birth weight at one week (normal vs high); the  dependent variable is resting heart rate.

this is appropriate

(b)

The independent variable is radiation treatment on throat cancer patients (after a low dose and then a high dose treatment); the dependent variable is white blood cell count.

inappropriate as the independent variable is not of ratio or interval category

c.         The IV is infant birth weight (low vs normal vs high); the DV is number of days absent from school in first grade.

Appropriate

d.         The IV is gender (male vs female); the DV is compliance vs noncompliance with a medication regimen.

inappropriate as the dependent variable is measured on nominal scale

e.         The independent variable is married status (single vs married); the dependent variable is happiness measured on a scale from 1 to 50

Appropriate

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