Prof. Gersch\'s brother, still wondering why Prof. Gersch goes through all the t

Question

Prof. Gersch's brother, still wondering why Prof. Gersch goes through all the trouble of collecting random samples for his analysis, decides to hang a sign in the lobby of Baruch which tells people to call him to report what grades they got. Fifty people call in. Prof. Gersch's brother collected a: Stratified Sample Cluster Sample Volunteer Sample Snowball Sample Probability Sample __________ Based on his research, Prof. Gersch's brother constructs his own 95% CI. Why does Prof. Gersch not accept his brother's confidence interval? I. His brother did not conduct a random sample II. His brother's method would always give an incorrect estimate of the mean III. His brother's method of collecting data tends to give very biased results IV. Sibling rivalry I only II only III only I and II I and III I, II, and III

Explanation / Answer

5. A voluntary sample is one of the main types of non-probability sampling methods. A voluntary sampleis made up of people who self-select into the survey. Often, these folks have a strong interest in the main topic of the survey. Suppose, for example, that a news show asks viewers to participate in an on-line poll.

Hence Prof. Gersch's brother collected a Volunteer Sample so answer is c.

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