The chance of a webpage visitor clicking on a link is 0.15. Angela believes that increasing the font size for the link will increase the proportion of visitors that click on the link.
After increasing the font size a sample of 90 visitors is taken and 20 clicked on the link.
Stating your hypotheses clearly test, at the 5% level of significance, whether or not there is evidence to support Angela's belief.
40 exam-style questions on WJEC A Level Maths 2.5 Statistical hypothesis testing, covering 2.5.1 Statistical hypothesis testing, 2.5.2 Statistical hypothesis testing, 2.5.3 Statistical hypothesis testing, 2.5.4 Statistical hypothesis testing, and 2.5 Statistical hypothesis testing. Each one has a worked solution and a mark scheme showing where the marks go.