A regression model
Explain that about 95% of values from any normal distribution are within ±2σ of the mean. Drag the slider and explain that this implies that 95% of the values from the regression model will be within the grey band.
Click the y-x rotation button then click Take sample several times. Observe that about 95% of crosses are within the band.
This means that :
The model can be summarised by a grey band ±2σ on each side of the regression line