QUESTION 3 Suppose you are the Director of Marketing at Unisa and you request the following statistics. Clas- sify the following data sources as either (i) primary or secondary; and (ii) internal or external. (a) Market research survey on prospective students academic needs. (2) (b) The pa st throughput rates of Unisa students. (2) (c) The pa st pass rates of University of Pretoria students. (2) (d) An opinion survey on programmes offered by Unisa. (2) (e) The economic statistics quoted in a newspaper. (2) (f) Employment statistics published by Stats SA. (2) 3 (g) 2021 share prices of the top performing 100 companies of the Johannesburg Stock Ex- change. (2) (h) Unisa statistics published by a statistician at Unisa. (2) (i) The amount of tuition fees paid by each student this semester. (2) (j) Personnel survey conducted by the Human Resource Director at Unisa. (2) [20] QUESTION 4 (a) What do you understand by the term "sampling"? (4) (b) State and briey explain the reasons why we sample? (15) [20] QUESTION 5 3 (a) What do you understand by the term "data capturing"? (4) (b) State the three stages involved in the data capturing process and briey explain them. (12) (c) What do you understand by the term "data security"