A restaurant's records show that 30% of its customers order a starter. On one day a random sample of 40 customers is taken, and 7 of them order a starter.
Stating your hypotheses clearly, test at the 5% significance level whether the proportion of customers ordering a starter has decreased.
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.