Suppose that you want to estimate the average age of the residents in your community.
a. Is this number a parameter or a statistic? Explain.
b. Suppose that you take a sample of people attending a local church on Sunday morning. Would you expect this sampling method to be biased for estimating the average age of community residents? If so, in which direction? Explain.
c. Suppose that you take a sample of drivers as they arrive at a local daycare facility. Would you expect this sampling method to be biased for estimating the average age of community residents? If so, in which direction? Explain.