Homecoming. A college Statistics class conducted a survey concerning community attitudes about the col- lege’s large homecoming celebration. That survey drew its sample in the following manner:...

Homecoming. A college Statistics class conducted a

survey concerning community attitudes about the col-
lege’s large homecoming celebration. That survey drew

its sample in the following manner: Telephone numbers
were generated at random by selecting one of the local
telephone exchanges (first three digits) at random and
then generating a random four-digit number to follow
the exchange. If a person answered the phone and the
call was to a residence, then that person was taken to be
the subject for interview. (Undergraduate students and
those under voting age were excluded, as was anyonewho could not speak English.) Calls were placed until a
sample of 200 eligible respondents had been reached.
a) Did every telephone number that could occur in that
community have an equal chance of being generated?
b) Did this method of generating telephone numbers
result in a simple random sample (SRS) of local
residences? Explain.
c) Did this method generate an SRS of local voters?
Explain.
d) Is this method unbiased in generating samples of
households? Explain.