Using the information provided, indicate which statistical test you think should

Question

Using the information provided, indicate which statistical test you think should be used for each of the following situations:

a.       Independent variable: normal birth weight vs. low birth weight infants; dependent variable: breathing rate (in breaths per minute).

b.      Independent variable: time of measurement of same patient (before, during, and after surgery); dependent variable: heart rate.

c.       Independent variable: time of measurement (before, during, and after intervention); dependent variable: did vs did not exercise regularly.

Independent variable: infertility treatment A vs infertility treatment B vs control condition; dependent variable: did vs did not become pregnant

Explanation / Answer

Solution:

a. Independent variable: normal birth weight vs. low birth weight infants; dependent variable: breathing rate (in breaths per minute).
Ans: Mann-Whitney U

b. Independent variable: time of measurement of same patient (before, during, and after surgery); dependent variable: heart rate.
Ans: Wilocoxon signed-ranks

c. Independent variable: time of measurement (before, during, and after intervention); dependent variable: did vs did not exercise regularly.
Ans: Kruskall-Wallis test

Independent variable: infertility treatment A vs infertility treatment B vs control condition; dependent variable: did vs did not become pregnant
Ans: Friedman test

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