Postdoctoral Fellow Walter Waters Used Nonrandom Sampling in His Study

Multiple Choice

Postdoctoral fellow Walter Waters used nonrandom sampling in his study of successful scientists.He knew most got excellent grades in high school and university,excelled in mathematics,and had a strong interest in science from a very young age.For his study,he was interested in sampling those who were successful as adult scientists but did poorly in high school,did average or worse in math classes,and showed little interest and aptitude in science until they reached university.What type of sampling was he using?

A) Snowball
B) Theoretical
C) Sequential
D) Deviant case
E) Quota