A statistics professor has just given the final examination in his introductory statistics course. In particular, he is interested in learning how his class of 50 students performed on this exam. The data are shown below. 
-(A) Technically, this process does not yield a random sample of the books in the store. Why not?
(B) How could a truly random sample be obtained?
Definitions:
Typing Speed
The rate at which a person can type text, often measured in words per minute.
Variation
The occurrence of differences or changes in the characteristics of entities within any population, leading to diversity.
Manipulation Of Typing Speed
the deliberate adjustment or control of one's typing speed, which can be applied for various purposes, such as reducing typos or matching the pace in a typing tutorial.
Independent Variable
A variable in an experiment that is manipulated to observe its effect on the dependent variable.
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