1.20 A statistics professor wanted to find out the average GPA (grade point average) for all...
1.20 A statistics professor wanted to find out the average GPA (grade point average) for all students at her university. She used all students enrolled in her statistics class as a sample and collected infor-mation on their GPAs to find the average GPA. a. Is this sample a random or a nonrandom sample? Explain. b. What kind of sample is it? In other words, is it a simple random sample, a systematic sample, a stratified sample, a cluster sample, a convenience sample, a judgment sample, or a quota sample? Explain. c. What kind of systematic error, if any, will be made with this kind of sample? Explain.
Homework Answers
a) This sample is a non-random sample.
b) This is a convenience sample.
c) There can be some systematic error with this kind of sample, since there is a high chance that all students from statistics class have a tendency to score good in exams.
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