The displacement of a mass suspended on a spring is modeled by the function y = 2sin(3 pi t), where y is measured in inches and tin seconds. The amplitude, period, and frequency of the motion of the mass are given by ​

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