Vol. 12, No. 3
March 2010
PQ Systems
Contents
Tweet with us on TwitterRead our Quality Blog
 

Send Quality eLine
to a friend!

Just type in your friend's email below:

 

Sign up
If you received this newsletter from a friend and want your own subscription to Quality eLine, click below.

Subscribe to Quality eLine

 
Software

 

   

Quality Quiz from Professor Cleary

Congratulations:
"B" is correct.

The third conclusion is that the distribution of sample proportions would form a normal distribution. This is the basis for building confidence intervals around a single sample proportion. The diagram below shows 10 sample proportions with confidence limits of plus or minus two standard deviations. If the binomial central limit theorem is true, one would expect about 95 percent of such confidence intervals to include the mean of the population, .50 in this case.

Remember—in a normal distribution, moving plus and minus two standard deviations would capture about 95% of the area under the curve.

Click here for a more complete video explanation

 

Quality Quiz Classics

Click here to register to win a free copy of Quality Quiz Classics

 

 

Copyright 2010 PQ Systems.
Please direct questions or problems regarding this web site to the
Webmaster.