Document aJqOrgy6jMY6Rxp4pxN1NbZ3N

Page 3725 1 .its results cannot therefore readily be generalized to 2 all brake maintenance workers. 3 How does the fact that the study was limited 4 to volunteers impact on its ability to be read as 5 applying across the board? 6 A In any study that is limited to volunteers, 7 there is always the question that bias is raised. 8 Some motive might be prompting these people 9 to come forward and tell about their experiences; 10 either the experiences have been in some way noxious, 11 or they have been in some way very special. 12 One of the comments that you persistently 13 read every time one of these sex surveys hits the 14 newspapers is that you have to be careful, because 15 these are people who were willing to talk about their 16 sex life. 17 Similarly, in this instance, these are 18 people who are willing to talk about their employment. 19 But on the other hand, the nature of a study like this 20 is one where I think the element of bragging, that is 21 the word for it, is very limited.