Income can have significant effects on people's spending patterns. Research studies have revealed that consumer expenditure is influenced by various factors such as their income, gender, age and level of education. In order to investigate the relationship between food expenditure and take home pay in Australia, a researcher plans to survey a sample of individuals across the country.
Briefly explain
(a) What type of survey method could the researcher use and why?
(b) What sampling method could the researcher use to select his/her sample and why?
(c) What kind of issues the researcher may face in this data collection?