Area Under the Curve of Skewed Distribution

[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!

[Bev D]

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...