Difficulty: Easy/Medium
A company knows that the probability that any pen it produces is defective is 0.08. An employee claims that the probability is now greater than 0.08.
The employee takes a random sample of 25 pens, and 5 of them are defective.
Stating your hypotheses clearly, test the employee's claim at the 5% significance level.
40 exam-style questions on WJEC A Level Maths 2.5 Statistical hypothesis testing, covering 2.5.1 Statistical hypothesis testing, 2.5.2 Statistical hypothesis testing, 2.5.3 Statistical hypothesis testing, 2.5.4 Statistical hypothesis testing, and 2.5 Statistical hypothesis testing. Each one has a worked solution and a mark scheme showing where the marks go.