In the Oneway platform, the Means and Std Deviations report contains summary statistics for each level of the X variable. The levels of the X variable define groups, or treatments.
Level
The levels of the X variable.
Number
The number of observations in each group.
Mean
The mean of each group.
Std Dev
The standard deviation of each group.
Std Err Mean
The estimates of the standard error for the group means. This value is the standard deviation divided by the square root of the number of values used to compute the group mean.
Lower 95% and Upper 95%
The lower and upper 95% confidence interval for the group means based on the individual group means, standard deviations, and sample sizes.
Note: These confidence intervals are generally narrower than the ANOVA confidence intervals.