2004, Question 6 · 4 points · about 25 minutes
Cholesterol drug interval and one-sided bound
Build and interpret a confidence interval for mean cholesterol reduction, explain why it disagrees with a one-sided test, then find the critical value and lower bound for a one-sided interval and compare conclusions.
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.
Not in the current course. Parts (c) and (d) ask for a one-sided confidence bound, which the current course does not include.
Lessons this question draws on
1 Read the question
The question is College Board's, from the 2004 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 November 25, 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 21) What the exam readers saw (Student Performance Q&A)
Question, scoring guidelines and Chief Reader report: College Board, from the Internet Archive. The title, summary are ours.