Q. Under what conditions would it be suitable to use a snowball sampling technique?

A. while the researcher absolutely must have a sample that is representative of the population from which it is drawn

B. while the characteristic of interest to the study is a deviant one and only a small number of people who know one another are required

C. while all you need to do is interview persons from a population where the sampling frame is called

D. while the questionnaire can be administered in a narrow geographic area

Q2. A star is forming within a nebula that is now 100 A.U. across and rotates at a rate of one revolution every 100 years. Assuming this is the result of a contraction, with no mass loss, of a previously existing nebula; what was the diameter of the nebula when it was rotating at a speed of one revolution every one million years?