Question

Researchers conducted a study to test a potential side effect of a new allergy medication. 200 subjects with allergies were used for the study. The new “improved” Brand A medication was randomly assigned to 100 subjects, and the current Brand B medication was randomly assigned to the other 100 subjects. 13 of the 100 patients with Brand A reported drowsiness, and 23 of the 100 patients with Brand B reported drowsiness.

(a) Construct and interpret a 90% confidence interval for the difference in proportions of subjects reporting drowsiness.

(b) Describe in detail a method that could have been used to randomly assign the Brand A and Brand B medications to the subjects.

Answer 1

a.

b.

Random assignment / placement is the experimental technique for assigning participants to different groups in an experiment

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