27 Question 6 continued Betsan also asked the knitters how happy knitting makes them feel on a rating of 0 ‘not at all’ to 100 ‘extremely’. She performed another Wilcoxon rank-sum test on the results to find out whether knitters who attend knitting groups find knitting makes them happier, on average, than knitters who do not attend knitting groups. The result of her test was to reject H0 at the 5% significance level. Betsan claims that her test shows that knitting in a group makes people happier than knitting on your own. (d) Suggest two other possible explanations for Betsan’s results. Assume that none of the knitters lied to Betsan and that she did not make any mistakes in her calculations. (2) _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ (Total for Question 6 is 12 marks) TOTAL FOR PAPER IS 80 MARKS 28 BLANK PAGE Every effort has been made to contact copyright holders to obtain their permission for the use of copyright material. Pearson Education Ltd. will, if notified, be happy to rectify any errors or omissions and include any such rectifications in future editions.