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Same number of gray marbles drawn from Jar A and Jar B - PowerPoint PPT Presentation


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

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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

More drawn

from Jar B

Same number of gray marbles drawn from Jar A and 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.