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%, Upper 95%
The lower and upper 95% confidence interval for the group means based on the standard deviations and sample sizes.
Note: These confidence intervals differ from the ANOVA confidence intervals, especially when the standard deviations of each group are different.
Std Dev Lower 95%, Std Dev Upper 95%
The lower and upper 95% confidence intervals for the standard deviations of each group. These columns are hidden by default. To show the columns, right-click in the table and select Columns > Std Dev Lower 95% and Columns > Std Dev Upper 95%.
Note: To show a plot of the confidence intervals for the standard deviations, right-click in the table and select Columns > ~Std Dev. The plot contains a vertical dashed line at the mean of the standard deviations. If the confidence interval for a group standard deviation contains the mean of the standard deviations, the interval is blue; otherwise, it is red.