Re: Help problem with MeanCI

• To: mathgroup at smc.vnet.net
• Subject: [mg5371] Re: [mg5343] Help problem with MeanCI
• From: Sherman Reed <Sherman.Reed at worldnet.att.net>
• Date: Thu, 5 Dec 1996 14:50:15 -0500
• Sender: owner-wri-mathgroup at wolfram.com

```At 06:47 AM 11/27/96 +0000, you wrote:
>I am trying to use the MeanCI[list, options] .. I given the followin
>input...
>
>number of sbsences  0 1 2 3  4 5 6 7 8 9 10
>Frequency           1 4 8 10 8 7 5 3 2 1 1
>
>I am to pretend that the variance in unknown and use MeanCI to find out a
>95% confidence interval.   I have no idea on how to do this... Can anyone
>
>Students at the University of Maryland
>
<<Statistics`ConfidenceIntervals`                       I NEED THIS PACKAGE
TO DO
THE MEANCI FUNCTION.
IT                                                         IS DEFINED IN THE
GUIDE TO
STANDARD MMA PACKAGES.

data={0,1,1,1,1,2,2,2,2,2,2,2,2,3,3,3,3,3,3,3,3,3,3,    THIS IS THE DATA
WHERE I

N[MeanCI[data],4]                                       NEXT I CALCULATE THE
MEANCI. WHEN THE VARIANCE
IS NOT KNOWN, IT IS NOT
STATED AND MMA USES THE
STUDENT T DISTRIBUTION

{3.43, 4.69}                                            HERE IS THE RESULT
AND IT
LOOKS REASONABLE
WHEN I                                                         CALC THE MEAN
N[Mean[data],4]
4.06                                                    THIS IS THE
CALCULATED                                                         MEAN

MOST HIGH SCHOOL TEXTS
ON STATISTICS HAVE GOOD
COVERAGE.  I USED TRIOLA'S
ELEMENTARY STATISTICS
SIXTH EDITION

HOPE THIS HELPED

Sherman C. Reed

```

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