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A quality control inspector in a bouncy ball plant must select a simple random sample of bouncy balls at the end of each day to make sure they are producing the required amount of bounciness.

Which of the following describes a valid simple random sampling procedure?

A

Place all of the bouncy balls for the day in a large container and mix them up. Draw $10\text{ bouncy balls}$ out of the container.

B

Place all of the solid color bouncy balls in one container and all of the swirly bouncy balls in another container. Mix the bouncy balls in each container and draw $10\text{ bouncy balls}$ out of each.

C

As the bouncy balls come off the production lines, randomly choose one of the first $50\text{ bouncy balls}$. Then choose every $50^\text{th}\text{ bouncy ball}$ after that one until the end of the day.

D

Place all of the bouncy balls from production line A into a large container. Do the same for production lines B and C. Mix up the bouncy balls in each container and draw $10\text{ bouncy balls}$ out of each.

E

All of the above describe a valid simple random sampling procedure.

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