Same number of gray marbles drawn from Jar A and Jar B

1
Statistically significant(happens by chance less
than 5 of the time)
6

4

How often difference between Jar A and Jar B
occurred
Statistical noise
2

0

0
20

10


10

20

Same number of gray marbles drawn from Jar A and
Jar B
More drawn from Jar B
More drawn from Jar A
We used our computer to do the marble experiment
10,000 times. The bell curve shows the
difference in the number of gray marbles drawn
from the 2 jars each time. As you can see, the
difference clustered around 0, most of the time
the difference is less than 13 marbles, but on
occasion we did get a bigger difference.