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AP Statistics
Unit 6 – Proportions
Topic 6.9
A company conducted a study to compare the proportion of customers who preferred their new product to the old one. The 99% confidence interval for the difference in proportions is (-0.10, 0.08). What does this interval suggest?
There is no evidence to support a difference in the proportions of customers who preferred the old and new products.
The proportion of customers who preferred the old product is significantly higher than the proportion who preferred the new product.
The proportion of customers who preferred the new product is significantly higher than the proportion who preferred the old product.
The study is inconclusive and needs to be repeated with a different sampling method.
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AP Statistics - 6.9 Justifying a Claim Based on a Confidence Interval for a Difference of Population Proportions
Key terms
Confidence Interval
Proportion
Difference in Proportions
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AP® and SAT® are trademarks registered by the College Board, which is not affiliated with, and does not endorse this website.
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