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I have a Standard Deviation of 20.41 for one group and 19.357 for the other, but i have a mean of 38.5 for the former and 52.3 for the latter.
would this matter, as it would go over the graph if i used the 3 S.D
or would i just have whatever could fit in (e.g. with the 52.3 mean i could fit in the standard deviation of 19.357 twice before it goes over the graph)
Sorry I don't understand what you want to do with your data?
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Its for a normal distribution curve in a histogram
I know but what do you want to do with the graphs? What does the question ask you to do?
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oh right.
its for a statistics project, and i am summarising data for exam results
and it the hypothesis is trying to prove wherever state (government funded) schools do worse compared to independent (privately funded) schools
Let X be the variable with E(X) = 52.3 and Sd(X) = 19.357. Let Y be the variable with E(Y) = 38.5 and Sd(Y) = 20.41
Then consider X-Y. Assuming X-Y follows a normal distribution, you can work out
and
Once you have both of them, solve
to find the probability that X is greater than Y.Offline
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