5. Determine if the following are (a) probability methods (b) if they are clusters, simple
random , quota or just convenience sampling methods and (c) is there any selection bias
a. A completely random method is used to select 75 students. Each undergraduate student in the fall semester has the same probability of being chosen at any stage of the sampling process.
b. An administrative assistant is asked to stand in front of the library one Wednesday and to ask the first 100 undergraduate students he encounters what they paid for tuition the Fall semester. Those 100 students are the sample.
c. The freshman, sophomore, junior, and senior years are number one, two, three and four, respectively. A random number generator is used to pick two of those years. All students in those two years are in the sample.
d. Undergraduate students are organized by certain categories (ex: race, sex, major, etc.). The survey required 3 members from each of the categories to be interviewed by the school newspaper. The newspaper writers determine who they will survey to collect their data.
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