Each group's sample standard deviation always equals the spread slider, so SSW = k(n − 1)s² and MSW = s². Press New data for a fresh random pattern of dots.
Sketch first, then compute. The worked solution builds line by line after a correct answer or when you ask for it.
Your jobQuick-fire questions: spot the picture with the biggest F, compute F = MSB ÷ MSW, count degrees of freedom and pairs, and make the reject or fail-to-reject call. Answer as many as you can in 60 seconds. Three right in a row earns double points. Keys 1 2 3 pick an answer.
Press Start to begin.
Fictional settings and practice numbers chosen to look realistic. They are not clinical reference values or advice.
Wrong picks are fine here. Each one tells you why.