Lidia parents have offered her two different options to earn her allowance for a 9-week period over the summer, she can either get paid $30 each week, or $1 for the first week, $2 second week,

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