Review: Select the appropriate test for each of the following situations. g) A d

Question

Review: Select the appropriate test for each of the following situations.

g) A dentist prescribes his patients to use an electric toothbrush, a regular soft-bristled toothbrush, or a regular medium-bristled toothbrush. After one year, he records whether each patient has gotten any new cavities.

One Proportion Z Test

One Sample T Test    

Two Proportion Z Test

Independent Samples T Test

Paired T Test

ANOVA F Test

Simple Linear Regression

Chi-squared test

*I tried Simple Linear Regression and that was not the answer! Please help!

Explanation / Answer

The chi-squared test is used to determine whether there is a significant difference between the expected frequencies and the observed frequencies in one or more categories.

Answer: Chi-squared test

The test has 3 groups and the observed measure is a frequency. Therefore linear regression cannot be used as the outcome is qualitative.

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