2026, Question 4 · Focus on Inference · 4 points
Orange yields under two fertilizers
Carry out a full significance test of whether mean orange counts differ between trees randomly given two fertilizer brands.
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 2026 exam. It starts on page 7 of the PDF.
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 18)
Question, scoring guidelines and Chief Reader report: College Board. The title and summary are ours.