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MathGroup Archive 1996

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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
>please help.. Thanks..
>
>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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