The Means for Oneway Anova report summarizes response information for each level of the nominal or ordinal factor.
Level
Lists the levels of the X variable.
Number
Lists the number of observations in each group.
Mean
Lists the mean of each group.
Std Error
Lists the estimates of the standard deviations for the group means. This standard error is estimated assuming that the variance of the response is the same in each level. It is the root mean square error found in the Summary of Fit report divided by the square root of the number of values used to compute the group mean.
Lower 95% and Upper 95%
Lists the lower and upper 95% confidence interval for the group means.