The probability of a biased die landing on 6 is 0.5. The die is going to be rolled 20 times. Polly suspects that the probability of the die landing on 6 is not 0.5. The critical region for the test is X≤5 X \leq 5\,X≤5 and X≥15X \geq 15X≥15.
Polly rolls the die 20 times. The die lands on six 16 times. Comment on Polly's suspicion in light of the experiment
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.