Question

In 2018, a survey was conducted in order to determine whether Tacoma residents support a downtown revitalization project. 200 Tacoma residents were interviewed, of which 50 were a small downtown business owners , 50 were downtown office workers , and 100 were downtown mall shoppers. As it turned out, 67% were in favor of the project.

a. What is the major source of bias in this survey

b. Find parameter if unknown state so

c. Find statistics if unknown state so

Answer 1

Solution:-

a) The major source of bias in this survey is selection bias.

When research samples sometimes under-represent certain people or groups, and over–represent others. Then that type of bias is called sample selection bias.

The best way to select people for research is using the basis of chance, so that everyone in the population being surveyed has an equal chance of selection.

b) The parameter of the survey is the proportion of Tacoma residents who are in support of downtown revitalisation project. The value of parameter is not given.

c) The parameter of the survey is the proportion of 200 Tacoma residents who are in support of downtown revitalisation project. The value of parameter is 0.67.