(a) Clearly explain the difference between Missing Completely at Random (MCAR), Missing at Random (MAR), and NonIgnorable NonResponse (NINR) as types of nonresponse. (b) Give one way the UCSA can minimise the unit nonresponse and one way to minimise nonresponse to weekly expenditure.4. The University of Canterbury Student Association (UCSA) wants to find out the average weekly expenditure of undergraduates at the university, whether they are living away from home or not, and if a student is working while studying. The university is supplying ages, gender, whether they are a domestic or an international student and the number of years at university