Summary
data from previous example
Margin
of Error for Means
n
= 30 Mean = 19.5 Standard Deviation = 1.2
Margin
Limits
Confidence Error +/-
Lower
Upper
------------------------------------------------------------
90%
0.3723 19.1277 19.8723
95% 0.4481 19.0519 19.9481
99%
0.6039 18.8961 20.1039
You are
95% confident that the actual mean age of the all incoming freshmen will be somewhere
between 19 years (the lower limit) and 20 years (the upper limit) of age. Note that both
measures are rounded.
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