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#1
21st September 2009, 12:47 AM
 ksana Inactive Registered Visitor   Registration Date: Sep 2009 Location: us, new york Posts: 1 Thanks Given to Others: 1 Thanked 0 Times in 0 Posts Karma Power: 15 Karma: 10
Area Under the Curve of Skewed Distribution

There are tables A, B, C in the appendix of the statistical books A(z scores),B(area between mean and z score),C(area between mean and z scores)for areas under normal curve Question:why table A isnt useful for using z scores to culculate area under skewed distribution? Can we use table A for any bell shaped curve (incl.those that are not normal)Why!
#2
21st September 2009, 04:53 PM
 Bev D Heretical Statistician   Registration Date: Jan 2003 Location: New England Posts: 2,535 Thanks Given to Others: 994 Thanked 1,666 Times in 1,017 Posts Karma Power: 320 Karma: 12801
Re: Area Under the Curve of Skewed Distribution

Quote:
 In Reply to Parent Post by ksana There are tables A, B, C in the appendix of the statistical books A(z scores),B(area between mean and z score),C(area between mean and z scores)for areas under normal curve Question:why table A isnt useful for using z scores to culculate area under skewed distribution? Can we use table A for any bell shaped curve (incl.those that are not normal)Why!
because there is a formula for the Normal distribution which describes it's area. the tables you reference are created from that formula. therefore they only apply to Normal distributions.

Skewed distributions are not Normal (they happen quite often tho!) Other symmetrical distributions are not Normal either even tho they mayhave "that bell shape" to them...
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 The Elsmar Cove Forum Area Under the Curve of Skewed Distribution

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