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View Full Version : Can anyone help with this problem!???

hlippke
10-30-2011, 05:15 PM
I can not figure it out...been trying to work it out the past hour but no luck....here it is:

A sample size 7 (n=7) has a mean of M=9. One of the sample scores is changed from X=19 to X=5. What is the value of the new sample mean???

PLEASE LET ME KNOW IF YOU UNDERSTAND THIS. THANK YOU SO MUCH!!

pka
10-30-2011, 05:22 PM
A sample size 7 (n=7) has a mean of M=9. One of the sample scores is changed from X=19 to X=5. What is the value of the new sample mean???
Here is a strong hint.
The sum of the seven data points is 63.
You are reducing that sum by 14.
What is the new average?

hlippke
10-30-2011, 05:25 PM
Oh okay so you just figured 7 * 9 is 63....so that is how you got the sum! So the new mean would be 7 correct???

pka
10-30-2011, 05:29 PM
Oh okay so you just figured 7 * 9 is 63....so that is how you got the sum! So the new mean would be 7 correct???
Correct.

hlippke
10-30-2011, 05:31 PM
Thank you!