Task 5: Mobile phones emit microwaves, and so holding one next to your brain for large parts of the day is a bit like sticking your brain in a microwave oven and pushing the ‘cook until well done’

button. If we wanted to test this experimentally, we could get six groups of people and strap a mobile phone on their heads (so that they can’t remove it). Then, by remote control, we turn the phones on for a certain amount of time each day. After six months, we measure the size of any tumour (in mm3

) close to the site of the phone antenna (just behind the ear). The six groups experienced 0, 1, 2, 3, 4 or 5 hours per day of phone microwaves for six months. Carry out an ANOVA to see if tumours increased with greater daily exposure. The data are in Tumour.sav. ②

Task 6: Using the Glastonbury data from Chapter 8 (GlastonburyFestival.sav), carry out a oneway ANOVA on the data to see if the change in hygiene (change) is significant across people with different musical tastes (music). Do a simple contrast to compare each group against ‘No Affiliation’. Compare the results to those described in Section 10.5. ②