Previous research by a restaurant found that 30% of customers will order a starter. One day a random sample of 40 customers is taken and 6 order a starter.
Test at the 5% significance level whether the proportion of customers ordering a starter has decreased.
153 exam-style questions on Edexcel A 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.