Parametric Statistics

Parametric Statistics - Histogram: No Skew (= 0) some say...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Parametric Statistics Powerful (Precise, Accurate) … BUT…. Not Robust: must meet the following Assumptions o Sample size is sufficient o Data are independent of one another (taken care of with methodology) o Normal Distribution : data for each population (treatment) come from a bell- shaped probability curve (range of values and the probability of each occurring in a random sample)
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Histogram: No Skew (= 0) some say <2 No Kurtosis (= 0) some say < 2 Normality Plot (ranked deviations vs. z scores) should be straight line Statistical tests for normality: Kolmogorov-Smirnov test , Shapiro-Wilks' W test , Lilliefors test o Equal variances among populations (treatment groups)...
View Full Document

This note was uploaded on 03/09/2010 for the course BIOL 406 taught by Professor Brandivanroo during the Spring '10 term at Framingham State College.

Ask a homework question - tutors are online