Edexcel S2 2014 June — Question 5

Exam BoardEdexcel
ModuleS2 (Statistics 2)
Year2014
SessionJune
TopicHypothesis test of binomial distributions
TypeTwo-tailed test critical region

5. A company claims that \(35 \%\) of its peas germinate. In order to test this claim Ann decides to plant 15 of these peas and record the number which germinate.
    1. State suitable hypotheses for a two-tailed test of this claim.
    2. Using a \(5 \%\) level of significance, find an appropriate critical region for this test. The probability in each of the tails should be as close to \(2.5 \%\) as possible.
  1. Ann found that 8 of the 15 peas germinated. State whether or not the company's claim is supported. Give a reason for your answer.
  2. State the actual significance level of this test.