Hi Team,
I am comparing two means and calculating Z score and then the p-value.
If i get the p-value less than 0.05 will I call it "YES THERE IS SIGNIFICANT DIFFERENCE"
OR
NO, THERE IS NO SIGNIFICANT DIFFERENCE???
Please give me some idea.
Regards
What is your SAS code ?
If i get the p-value less than 0.05 , I can call it "YES THERE IS SIGNIFICANT DIFFERENCE" .
But I will more trust confidence interval .
You should decide what would be a significant difference BEFORE the test and know why you chose that value.
The P-value =0.05, is not always useful. First go back to your problem and decide how accurate you want to be. Then decide on your p-value- not necessarily 0.05.
Then go ahead with what you are doing.
These are just my thoughts.
Thanks.
There is a lot more to interpreting statistical significance than just looking at the p-value. See, for instance,
http://ceaccp.oxfordjournals.org/content/7/6/208.full
Your second claim, "NO, THERE IS NO SIGNIFICANT DIFFERENCE???" is a statement about the type II error and not about the type I (p-value) error. The correct interpretation statement is
"We failed to determine statistical significance.", which is much weaker.
Doc Muhlbaier
Duke
Great reference, Doc. I want to send it to all of the toxicology study directors
Steve Denham
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