| Exam Board | OCR |
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| Module | H240/02 (Pure Mathematics and Statistics) |
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| Year | 2020 |
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| Session | November |
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| Topic | Hypothesis test of binomial distributions |
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| Type | Perform one-tailed hypothesis test |
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10 Pierre is a chef. He claims that \(90 \%\) of his customers are satisfied with his cooking. Yvette suspects that Pierre is over-confident about the level of satisfaction amongst his customers. She talks to a random sample of 15 of Pierre's customers, and finds that 11 customers say that they are satisfied. She then performs a hypothesis test.
Carry out the test at the 5\% significance level.