Question

select the correct answer. to determine which window cleaner is most effective, thad washes half of the windows in his house with one brand and the other half with a different brand. he then compares the results to draw a conclusion about which cleaner is most effective. what kind of statistical study did thad conduct? a. observational study b. theoretical study c. survey d. experiment

Explanation:

An experiment involves manipulating variables (here, using different window cleaner brands) and comparing results. Thad used two brands (manipulated the cleaning agent) and compared window cleaning outcomes, which fits the experiment definition. An observational study just observes, a theoretical study is non - empirical, and a survey involves asking questions, not direct manipulation.

Answer:

D. experiment