A factory has 20 assembly lines producing a popular toy. To inspect a representative sample of 100
Toys, quality control staff randomly selected 5 toys from each line's output. Was this a simple
Random sample?
A) Yes, because each toy produced had an equal chance to be selected.
B) No, because toys do not come off the assembly line at random.
C) Yes, because a stratified sample is a type of simple random sample.
D) No, because not all combinations of 100 toys could have been chosen.
E) Yes, because the toys were selected at random.

Question

Quizplus · Accepted Answer

The sample is not a simple random sample because it was stratified by selecting 5 toys from each assembly line, meaning not all combinations of 100 toys could have been chosen.

A Factory Has 20 Assembly Lines Producing a Popular Toy