2009, Form B, Question 6 · Investigative Task, no longer on the exam · 4 points · about 25 minutes
Relative risk for two disease treatments
Decide whether the trial could be double-blind, build a confidence interval for a difference in survival proportions, then estimate a relative risk and turn a given interval for its logarithm into an interval for the ratio.
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 2009, Form B exam. It starts on page 10 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 April 9, 2025.
Open Question 6 (PDF, page 10)
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 16)
Question, scoring guidelines and Chief Reader report: College Board, from the Internet Archive. The title and summary are ours.