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. theoretical study b. experiment c. survey d. observational study

Explanation:

Thad manipulates a variable (window - cleaner brand) by washing different halves of windows with different brands and then observes the results. This is the key characteristic of an experiment. In an observational study, no variable is manipulated. A survey involves collecting data through questions, and a theoretical study is based on mathematical or logical models rather than physical manipulation of variables.

Answer:

B. experiment