Significant differences, gains/losses and variance

The C figure in Significant Difference and Break-even Point was suspicious because it had a rather skewed distribution.

I just noticed that decentralization is the only difference that can be expressed.

A and B have no significant difference, but B is higher in profitability.

Even if there is no difference in the mean, there may be a difference in the variance.

https://gyazo.com/277dc870eeb49cc1d88a7be3c40b6994

This is the same composition as that of The value of quality variation depends on the level of demand. explained in How to come up with good ideas.

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