For each situation here critique the methods used:

(i)To study attitudes toward a chain of supermarkets, interviewers were stationed in the. Parking lots of stores in the chain and questioned all those willing to answer.

(ii)In studying the results of a screening method for credit card applications for a department store, folders of applicants were selected at a fixed interval beginning at a random starting point in the front of the first file drawer.

(iii)To develop information on thepurchasersof its new video games, Space Cowboys, the manufacturer made the activation of the product warrantee conditional upon the receipt of the warrantee card, which also contained a short questionnaire.