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Calculate an approximate 93% confidence interval for the fraction of college students who own a car.
Mathematics 9709 · AS & A Level · Sampling and estimation
Sampling and estimation — practice question
From a sample of 200 students picked at random from one college, 23% reported that they had a car.
Worked solution & mark scheme
This 3-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Apply confidence interval formula $0.23 \pm z\sqrt{\dfrac{0.23(1-0.23)}{200}}$” …
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