Q3. [11 marks] A researcher was interested in finding the percentage of mail carriers in lower mainland BC who had been bitten by a dog in the past year. All mail carriers in lower mainland BC were divided into four groups according to gender (male or female) and according to whether they walk or ride on their routes. Then 50 were randomly selected from each group and interviewed. It was reported that 18% of mail carriers had been bitten by a dog in the past year. (9 marks)

a) Describe the population of interest. [1]

b) Describe the sample in this study. [1.5]

c) What is the possible sampling frame used in this study? [1]

d) Name the sampling design used in this study. [1]

e) Name and describe the variable of interest. [2]

f) Which scale of measurement is most appropriate to describe the variable? [0.5]

g) Describe the most appropriate statistic and parameter in context?