answer all questions with explanation

A researcher was interested in Aucklanders' opinions about rates and rate increases. He considered 3 different approaches to gathering information on this. Method 1: Randomly select 1,000 names from the Auckland phone book. Then hire a team of people to phone each person on the list and interview them. Method 2: Place advertisements in community papers asking people to go online and fill in a questionnaire. Method 3: Use council records to assemble a list of all houses currently in Auckland City. Randomly select 1,000 houses from this list and post a questionnaire to each address asking the oldest person living in the house to fill in and return the questionnaire. (a) For which of the methods, if any, is non-response bias a potential problem? [1 Mark] (b) For which of the methods, if any, is self-selection bias a potential problem? [1 Mark] (c) Which of the methods, if any, is subject to interviewer effects? [1 Mark] (d) Which of the methods, if any, is subject to sampling errors? [1 Mark] (e) For each of the methods, give an example of why there may be selection bias. [3 Marks]