The discrete random variable X∼B(40,0.3)X \sim B(40, 0.3)X∼B(40,0.3)
Previous research by a restaurant found that 30% of customers will order a starter. On one day a random sample of 40 customers is taken and 7 order a starter. Give your answers to 3 significant figures where appropriate.
Find P(3<X≤7)P(3 < X \leq 7)P(3<X≤7)
Test at the 5% significance level whether the proportion of customers ordering a starter has decreased.
State the conclusion you would have reached if you tested at the 10% significance level.
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.