answer the questions a,b,c he b. Describe the sample in this problem. c. Is this

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answer the questions a,b,c

he b. Describe the sample in this problem. c. Is this a random sample? Justify your answer. 1.28 Demographics and Population Statistics State Farm Insurance Company would like to estimate the proportion of volunteer firefighters across the country who are full-time teachers. The 25 largest volunteer fire companies in the United States are identified. Each is contacted and asked to complete a short survey regarding the number of volunteers and the occupation of each volunteer. Is this an observational or an experimental study? b. Describe the sample in this problem. c. Is this a random sample? Justify your answer. 1.29 Manufacturing and Product Development The

Explanation / Answer

a. Clearly, this is an observational study because there is no intervention done while collecting the data.

b. Sample is the set of all fire volunteers associated with each of the 25 largest volunteer fire companies.

c. No, clearly this is not a random sample because there is sampling bias involved in the sampling process. Note that we only collect the data from 25 largest volunteer fire companies. And therefore, the collected data may not be the true representative of the actual population and hence it is not a random sample.

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