For each of the following scenarios state the most appropriate statistical test.

a. People are classified into two groups depending on whether they were abused as children and the recorded outcome is whether they have had a conviction for theft.

b. Groups of people in four different industries are selected at random and their blood pressures are measured, as the investigators are interested in a possible association between blood pressure and type of workplace.

c. It is thought that the position of a person's surname in the alphabet may, as a result of childhood experiences of waiting for names to be announced in alphabetical lists, lead to personality differences. Accordingly, a psychological test that gives a numerical score on an introversion-extroversion scale is administered to a group of people. About half the people in the group have surnames starting with the first four letters of the alphabet and the remainder have surnames starting with the last four letters of the alphabet. The introversionextroversion score of all these people is assessed. Assume that inspection of the figures suggests that it is reasonable to believe that the data come from a normal distribution. P-963