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Author Topic: 'Inverse Normal' Notation  (Read 2505 times)  Share 

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BubbleWrapMan

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'Inverse Normal' Notation
« on: October 31, 2011, 04:43:26 pm »
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There's been a few instances where I've needed the inverse normal function to complete a question. But I realised I don't really have a way to notate it other than "inverse normal function with area = 0.9..."

I know that for binomial we use X ~ Bi(n,p) and for normal we use X ~ N(µ,σ), so what I'm wondering is,

1) Is there any sort of notation like that for the inverse normal function?

or

2) Can we say for example

X ~ N(67,1), Pr(X ≤ x) = 0.358, then proceed to give the value for x?
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b^3

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Re: 'Inverse Normal' Notation
« Reply #1 on: October 31, 2011, 04:46:52 pm »
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Just to jump along with this post.
For the normal is it just σ(sd) or is it σ2(variance) that we put in the X ~ N(µ,σ). EDIT: we put sd in the calc but do we write sd or var in the brackets? I've seen two different exams do it differently.

I thought I remember reading variance somewhere but I may be wrong.
« Last Edit: October 31, 2011, 04:52:02 pm by b^3 »
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omgwtf123

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Re: 'Inverse Normal' Notation
« Reply #2 on: October 31, 2011, 04:53:23 pm »
+1
i believe its X~N (Mean, Variance) xD, but hopefully someone can confirm this :)

tony3272

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Re: 'Inverse Normal' Notation
« Reply #3 on: October 31, 2011, 04:54:41 pm »
+1
My teachers say that it's variance.
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BubbleWrapMan

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Re: 'Inverse Normal' Notation
« Reply #4 on: October 31, 2011, 05:10:45 pm »
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Hm, that's interesting, let me see.

2009 Exam 2 report has X ~ N(67,1)

Which is hilarious...

Oh, here we go. 2010 Exam 1 has X ~ N(5,9) where σ = 3, so yeah, you use variance. Lucky I brought this up, lulz. Thanks guys.
« Last Edit: October 31, 2011, 05:18:24 pm by ClimbTooHigh »
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Re: 'Inverse Normal' Notation
« Reply #5 on: October 31, 2011, 05:12:10 pm »
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Thanks guys (aswell).
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Asx4Life

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Re: 'Inverse Normal' Notation
« Reply #6 on: October 31, 2011, 08:28:24 pm »
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Nvm. The other thread answered by question  ;D
« Last Edit: October 31, 2011, 08:30:18 pm by Asx4Life »