Andy plays tennis. The probability that any one of his serves lands in court is 0.6.
Andy's coach thinks that this probability has changed. Andy serves 50 times in a set, and 35 of the serves land in court.
Stating your hypotheses clearly, test the coach's belief at the 10% significance level.
32 exam-style questions on WJEC A Level Maths 2.5.1 Statistical hypothesis testing. Each one has a worked solution and a mark scheme showing where the marks go.