Question

when jim surveyed 5 sixth - grade students at the community skating rink, he found that only 1 out of the 5 had completed the science project. he knows there are about 160 sixth - grade students in his community, so he infers that around 32 students have finished their science project. is this a good inference?
no, jim did not make a good inference because his sample is too small and may be biased because he only asked students that were at the rink.
no, jim did not make a good inference because his sample is too small and 32 is not in the same proportion to the population as 1 to 5.
yes, jim made a good inference because 32 is the same proportion to the population as 1 to 5.
yes, jim made a good inference because most students at the rink were sixth graders.

Explanation:

A good inference requires a representative and sufficient - sized sample. Jim only surveyed 5 students at the skating rink, which is a small sample. Also, students at the skating rink may not be representative of all sixth - grade students in the community, so the sample may be biased.

Answer:

No, Jim did not make a good inference because his sample is too small and may be biased because he only asked students that were at the rink.