Anew compact car can travel 288 miles on nine gallons of gas. the distance driven in miles y varies directly with the number of gallon of gas x. this situation can be represented by the equation y = 32x.

Aresearch study is done to find the average age of all u. s. factory workers. the researchers asked every factory worker in ohio what their birth year is. this research is an example of a census survey convenience sample simple random sample