Community Ages Take the community you live in to be the popu

Community Ages Take the community you live in to be the population of interest. Suppose you want to estimate the average age of all residents in the community. Is this number a parameter or a statistic? Explain. 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. 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 presidents? If so, in which direction? Explain.

Solution

a)

This is a parameter, because it deals with a population (age of ALL RESIDENTS in the community).

b)

I think it will be biased, because usually, nowadays, mostly older people go to the church. (Is this the case in your place?) Thus, it will be biased towards the positive direction.

c)

I think this will be biased again, as there is a minimum age for driving (18), and mostly drivers are older ones. Thus, it will be biased towards the positive direction again.