A factory produces light bulbs. The probability that any light bulb is faulty is 0.10.
A sample of 12 light bulbs is taken. Find the probability that 2 or more light bulbs are faulty.
A technician claims that the probability that a light bulb is faulty is more than 0.10. They take a sample of 15 light bulbs and 4 are faulty. Stating your hypothesis clearly, test the technician'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.