For each of the following situations, indicate how you might use ratio or regression estimation.
a Estimate the proportion of time in television news broadcasts in your city that is devoted to sports.
b Estimate the average number of fish caught per hour for anglers visiting a lake in August.
c Estimate the average amount that undergraduate students at your university spent on textbooks in fall semester.
d Estimate the total weight of usable meat (discarding bones, fat, and skin) in a shipment of chickens.