Quality eLine Newsletter
August 2004
Vol. 6, No. 8

Quality Quiz
from Professor Cleary

Congratulations! 
You're right!

Click here to watch a video for a more complete answer.

It is clear that Marge Orrine has no clue about the meaning of her formula, impressive as that formula seems.

The concept of standard deviation reflects the amount of variability in the data:

This is how Marge came up with a standard deviation of 3:

Step 1: Determining the mean of the data:

Step 2: Determine the sum of the squared deviations of the mean:


Step 3: Plug data into formula to calculate standard deviation.

Maybe Marge will read this quiz to improve her understanding of standard deviation. She might also consider a more complete video explanation of standard deviation.

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