A random sample of 350 registered voters found that 196 support a proposed transit tax, and a 95 percent confidence interval for the proportion of all registered voters who support it was computed to be 0.508 to 0.612. Which of the following conclusions about majority support is best supported by this interval?
constructing a confidence interval for a population proportion
Review constructing a confidence interval for a population proportion for AP Statistics and try 2 free AP-style practice questions. 16 questions on this topic in AP Statistics · Unit 6 · Inference for Categorical Data: Proportions.
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A simple random sample of 120 households finds that 42 subscribe to a streaming service (). A confidence interval is . Assuming conditions are met, which of the following actions would produce a confidence interval with a smaller margin of error and a lower confidence level than ?
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Answer, then see why
The price of gasoline rises 10% and the quantity demanded falls 5%. What happens to total revenue?
Not quite. The answer is B.
Why the other options are wrong
AI grading for free-response
Write your FRQ answer and get it scored point by point against the AP rubric, with the line from your answer that earned or missed each point.
Reason: Correctly identifies demand for gasoline as inelastic.
Evidence: "The price of gasoline rises and the quantity falls only a little."
Reason: Graph shows relatively inelastic demand.
Evidence: Draws a steep demand curve.
Reason: Correct new equilibrium price.
Evidence: Shifts supply left, P1 → P2.
Reason: With inelastic demand, a price increase raises total revenue.
Evidence: "Revenue goes down."