Re: What number in my formula is missing for finding 95% intervals?
- From: Jack Tomsky <jtomsky@xxxxxxxxxxxxx>
- Date: Wed, 28 Nov 2007 13:01:41 EST
I don't understand how the 95% Interval bounds are
calcuated because when I
check the numbers to find the bounds, this is what I
get:
(1.96*.40825) + 2 = 2.80017
(1.96*.40825) -2 = 1.19983
When I use the ti83 calculator:
standard deviation: .81650
Mean: 2
N: 4
Standard Error: .40825
CI: 95% or (1.96)
The calculator outputs:
Lower bound: .7008, Upper bound: 3.2992
Please help me. Thanks, Misty
--
Message posted via MathKB.com
http://www.mathkb.com/Uwe/Forums.aspx/math-statistics/
200711/1
Your formula should be 2 +/- .81650*t(3,.975)/sqrt(4).
Jack
.
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