supergrass
Joined: Apr 6, 2014
• Posts: 58
January 14th, 2016 at 7:14:51 AM permalink
Suppose on a 5c machine I have hit a particular prize (somewhat like a jackpot) 13 times after 1000 spins.
Suppose on a 2c machine I have hit it 5 times after 1000 spins.
How confident can I say the two machines have different settings for the particular prize?
Last edited by: supergrass on Jan 14, 2016
Romes
Joined: Jul 22, 2014
• Posts: 5400
January 14th, 2016 at 7:52:08 AM permalink
Playing it correctly means you've already won.
Bondy3
Joined: Jan 4, 2013
• Posts: 106
January 17th, 2016 at 8:33:43 PM permalink
assuming the probability of a jackpot is 1%, the standard deviation is for 1000 spins is 3.6, so that means that the 5c machine is less than 1 standard deviation over and the 2c machine would be 1.5 standard deviation under, both are within statistically accepted ranges.

with such a small sample size its not possible to detect with confidence that the machines are on different settings

variance of a set of spins = npq

n=number of spins
p=probability of jackpot
q=probability of non-jackpot
supergrass
Joined: Apr 6, 2014