A machine that automatically controls the amount of ribbon on a tape has recently been installed This machine will be judged to be effective if the standard deviation of the amount of ribbon on a tape is less than 15 cm If a sample of 20 tapes yields a sample variance of S2 025 cm2, are we justifie...

The Answer is in the image, click to view ...

A machine that automatically controls the amount of ribbon on a tape has recently been installed. This

Question:

A machine that automatically controls the amount of ribbon on a tape has recently been installed. This machine will be judged to be effective if the standard deviation

σ of the amount of ribbon on a tape is less than .15 cm. If a sample of 20 tapes yields a sample variance of S2 = .025 cm2, are we justified in concluding that the machine is ineffective?

Fantastic news! We've Found the answer you've been seeking!