The probability that a visitor to a webpage clicks on a particular link is 0.15. Angela increases the font size of the link and believes that this will increase the probability of a visitor clicking on it. After the change, 20 of a random sample of 90 visitors click on the link.
State the null and alternative hypotheses, using p p\,p for the population probability that a visitor clicks on the link after the change.
Calculate the probability, assuming the null hypothesis is true, of obtaining at least 20 clicks.
Complete the hypothesis test at the 5% level of significance.
209 exam-style questions on CCEA A Level Maths 4.6 Statistical hypothesis testing (A-level only), covering 4.6.1 Statistical hypothesis testing (A-level only), 4.6.2 Statistical hypothesis testing (A-level only), 4.6.3 Statistical hypothesis testing (A-level only), 4.6.4 Statistical hypothesis testing (A-level only), and 4.6.5 Statistical hypothesis testing (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.