Policies: Answer all 4 questions. Calculators are allowed. You may answer the questions in any order you like. Show your working,

1. Non-response is an example of an error of non-observation. Imagine you are conducting a survey by SRS, using a questionnaire to gather data to estimate some population mean 4.

(a) Explain how non-response might occur in your survey.

(b) Explain how non-response can be a problem for surveys.

(c) Outline some ways to reduce the non-response rate which can be implemented before the data is collected

(d) Outline some ways to handle non-response which can be implemented after the initial data has been collected.