Sociologists argued that women on average earn less than men as women often choose to work less hours. They further suggest that the choice of hours worked may be driven by various factors such as...

Sociologists argued that women on average earn less than men as women often choose to work less hours. They further suggest that the choice of hours worked may be driven by various factors such as age, childcare needs, occupation choice and flexibility. To investigate the relation between hours worked and income earned by Australian men and women, a researcher plans to survey a sample of individuals across the country. Briefly explain
a) What type of survey method the researcher could use and why?
b) What sampling method could the researcher use to select his/her sample and why?
c) What are the two main variables the researcher should consider collecting data for the purpose of the above analysis and why? Identify the data type(s) for the variables.
d) What kind of issues the researcher may face in this data collection?                                         PLEASE SOLVE THE d)PART OF THE QUESTION ONLY THANKS