Kate has 2 books. She buys some more. Then she has 9 books. How many books does Kate buy? Stretch your thinking look at the story above. Does the answer need a label to make sense? Explain

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