State the sampling technique that will best describe in each of the following. Justify your choice.

Case I :A certain university has 850 teachers and employees distributed into 4 colleges namely 1) Engineering, 2) Business, 3) Education and 4) Information Technology with population of 50, 200, 450 and 150 respectively. If you wish to determine the sample size, what technique would you adopt?

Case II:You are inclined to study on the problems encountered by5 selected government colleges particularly on the performance of teachers new teachers.The respondents of the study are the new teachers which relatively numbering for about 600. How would you choose the samples?

Case III:You are assigned to conduct study regarding causes of tardiness among non-teaching employees on reporting to work everyday. How would you choose the respondents to realize your study and what technique would be best adopted?

Case IV:You would be introducing a new curricular program in your university to increase the enrolment because the university's enrolment has been declining for the past years. Initially, you would want to find out whether such academic program will be the preferred course by the incoming students. What technique would you use and why?