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zguan
zguan
Level I

Confidence Interval in the Oneway Anova

Created: Jul 22, 2020 01:36 PM  |  Last Modified: Jun 8, 2023 5:18 PM (3367 views)

Hello,

 

I'm using the "Big Class" data table to run the Oneway ANOVA analysis for "height" and notice that the confidence interval values are different between the "Means for Oneway Anova" table and "Means and Std Deviations" table.

My calculation is the same as the "Means and Std Deviations" table, but am trying to understand why they are different from the other table.

zguan_0-1595439183980.png

 

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Mark_Bailey
Staff Mark_Bailey
Staff
Solution

Re: Confidence Interval in the Oneway Anova

Jul 22, 2020 03:01 PM (3354 views)  |  Posted in reply to message from zguan 07-22-2020

The first result, as noted at the bottom of the first table, uses the pooled estimate of the standard error of the mean. The second table computes statistics, including the standard error, separately for each level of the categorical factor. That is, the estimates of the standard error in the second table are not pooled.

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Mark_Bailey
Staff Mark_Bailey
Staff
Solution

Re: Confidence Interval in the Oneway Anova

Jul 22, 2020 03:01 PM (3355 views)  |  Posted in reply to message from zguan 07-22-2020

The first result, as noted at the bottom of the first table, uses the pooled estimate of the standard error of the mean. The second table computes statistics, including the standard error, separately for each level of the categorical factor. That is, the estimates of the standard error in the second table are not pooled.

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