A rodar pulse is sent from the Earth to an asteroid, bounces off and returns to Earth. The radar pulse travels of the speed of light (300,000 km/sec) and takes 150 seconds to
travel out and return. How far away is the asteroid?

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