Paper 3 · Statistics5.1 Statistical hypothesis testing
A company says 25% of its customers use its app. After a campaign, a random sample of 30 customers finds that 13 use the app. The company tests, at the 5% level, whether the proportion has increased.
(a)
Write down suitable hypotheses for the test, defining the parameter you use.
1 markSay your answer out loud or jot it down, then compare.