Im in statistics class and I been trying to figure out the answer too. I couldn't find it online. Luckily I had the answer to the problem I was trying answer, so to figure out what it was I worked it backwards.
BASICALLY I THINK ITS ANOTHER WAY OF SAYING
(confidence interval)
which for most problems is either
90% 95% 99% or in decimal form is .9 .95 .99
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the mean is important in statistics because you will find out your average and can compare that mean to other things..
the mean is affected by outliers
Probability/ Statistics
MDS
The direction in which the trend analysis points.