A printer produces tickets. The probability that any ticket is printed incorrectly is 0.15.
A sample of 10 tickets is taken. Find the probability that 2 or more tickets are printed incorrectly.
A manager claims that the probability that a ticket is printed incorrectly is more than 0.15. They take a sample of 12 tickets and 4 are printed incorrectly. Stating your hypothesis clearly, test the manager's claim at the 5% significance level.
33 exam-style questions on Edexcel AS Level Maths Hypothesis Testing, covering 7.1 Hypothesis Testing, 7.2 Finding Critical Values, 7.3 One-Tailed Tests, and 7.4 Two-Tailed Tests. Each one has a worked solution and a mark scheme showing where the marks go.