| Exam Board | OCR |
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| Module | S2 (Statistics 2) |
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| Year | 2011 |
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| Session | January |
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| Topic | Hypothesis test of a Poisson distribution |
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5 A temporary job is advertised annually. The number of applicants for the job is a random variable which is known from many years' experience to have a distribution \(\operatorname { Po } ( 12 )\). In 2010 there were 19 applicants for the job. Test, at the 10\% significance level, whether there is evidence of an increase in the mean number of applicants for the job.