This applet simulates Galton’s Board, in which balls are dropped through a triangular array of nails. This device is also called a quincunx. Every time a ball hits a nail it has a probability of 50 percent to fall to the left of the nail and a probability of 50 percent to fall to the right of the nail.
The piles of balls which accumulate in the slots beneath the triangle will resemble a binomial distribution. To reach the bin at the far left the ball must fall to the left every time it hits a nail.
Because Galton’s board consists of a series of experiments the piles in the slots are the sum of 10 random variables. Therefore, this simulation provides also an illustration of the central-limit theorem, which states that the distribution of the sum of n random variables approaches the normal distribution when n is large. When we add more rows of nails to the board the approximation would be better.
Other things to do:
Draw a Graph of the normal distribution
Regression applet
Do a statistical analysis on binary data: logistic regression
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