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. survey

b. observational study

c. experiment

d. theoretical study

Explanation:

An experiment involves manipulating variables (here, using different window cleaner brands) and observing the outcome (cleaning effectiveness) to draw conclusions. A survey collects data via questions, an observational study just observes without manipulation, and a theoretical study uses models/theory. Thad manipulated the cleaner used, so it's an experiment.

Answer:

C. experiment