Ryan earns $5 for each small dog he walks and $8 for each large dog he walks. today he walked 8 dogs and made a total of $49. how many small dogs did ryan walk? ryan walked small dogs.

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