Mathematics (AS & A Level) · Oct / Nov 2019 · Paper 73 · Question 4

A train company claims that 92% of trains on a particular line arrive on time. Sanjeep suspects that the true percentage is less than 92%. He chooses a random sample of 20 trains on this line and finds that exactly 16 of them arrive on time. Making an assumption that should be stated, test at the 5% significance level whether Sanjeep’s suspicion is justified. [6] 7

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