State Farm Insurance Company would like to estimate the proportion of volunteer

Question

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.

a) Is this an observational or an experimental study? Please explain your answer.

b) Describe the sample in this problem.

c) Is this a SRS? Justify your answer. If this is not a SRS, how would you change the sampling technique so that it would be random.

Explanation / Answer

Solution:

a) Observational study. We only observe the response for a specific variable for each individual.We are not telling the volunteers what their other job is

b) The sample is the 25 largest volunteer fire companies in the United States.

c) It is not SRS, since it chose the 25largest volunteer fire companies in the U.S. We can changeit to SRS by randomly choosing the volunteer fire companies in the U.S

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