2005, Form B, Question 3 · 4 points
Mosquito repellent experiment designs
Describe how to randomize and what inference to use for a completely randomized design and for a matched pairs design comparing two repellents, then argue which design is better.
This exam had six free-response questions, each scored from 0 to 4. Its Question 6, the Investigative Task, is no longer part of the exam. The current exam has 4 free-response questions in 90 minutes. The skills these questions practice still count.
1 Read the question
The question is College Board's, from the 2005, Form B exam. It starts on page 7 of the PDF. College Board no longer posts this exam, so it opens from the copy of College Board's PDF that the Internet Archive saved on December 4, 2025.
2 Write your answer
Answer each part the way you would on the exam, in full sentences, with your work shown. Your writing saves as you type.
3 Score it
Score your answer against College Board's scoring guidelines, one point at a time. Give yourself a point only when your answer says what the guideline asks for.
Scoring guidelines (PDF, page 6)
Question, scoring guidelines and Chief Reader report: College Board, from the Internet Archive. The title and summary are ours.