Question

Suppose a special interest group in a state is promoting an amendment to the state constitution so that residents can legally consume marijuana for medical and recreational use. They declare that voters in the state are strongly in support of legalization of marijuana. This declaration is based on data collected in a sample survey. The group used the white pages of telephone directories of the three largest metropolitan areas in the state and randomly selected residential phone numbers to call in each city. They made calls until they had 500 responses per area

a. It consists of registered voters

b. None of the answers is correct.

c. It is likely biased due to undercoverage

d. It is a nonprobability sample

Answer 1

The sample was randomly selected from the white pages of the telephone directories of three largest metropolitan areas in the state. This means that there was biasedness in the data as the sample was not representative of the entire population of the state. This is because the sample didn't have people who didn't have a telephone at their homes. Also, the sample only had people from the three largest metropolitan areas in the state meaning the people from small areas were not included. Therefore, there was undercoverage of the data collected.
Hence, C) It is likely biased due to undercoverage is correct