Normal distribution
The Normal distribution was studied by Gauss. This is a continuous random variable (the variable can take any real value). The density function is shaped like a bell.
Two parameters determine a normal distribution: the mean and the standard deviation. The higher the standard deviation the greater the variable dispersion.
The normal distribution is symmetrical in relation to the mean.
The mean is represented by a triangle than can be seen as a point of equilibrium. By dragging it we can modify the mean. We can get the same effect moving the point at the top of the curve.
Dragging the other point on the curve (which is one of the two inflexion points of the curve) we modify the standard deviation.
We can see the accumulative distribution function and how it change by modifiyng the mean (simple translation) and the standard deviation (reflecting greater or lesser dispersion of the variable).
The gray dots control the vertical and horizontal scales. By pressing the right button and dragging we can move left and right.
