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Rehab Research

Chapter 21: Statistical Aalysis of Differences: The Basics

What are the three most common distributions used for statistical tests? t, F, and chi-squared distributions
What are parametric tests? based on specific assumptions about the distribution of populations; use sample statistics such as the mean, standard deviation, and variance to estimate differences between population parameters
What are nonparametric tests? use rank or frequency information to draw conclusions about differences between populations (parametric are often more powerful and preferred)
What are the assumptions of parametric testing? 1 participants are randomly selected from normally distributed populations, 2 populations variances of the groups being tested are equal, 3 measurement level of the data as interval or ratio
When are data sets independent? when values in one set tell nothing about values in another set
When are data sets dependent? when the sets of numbers consist of repeated measures on the same individuals
What are the steps in the statistical testing of differences? the ten steps, page 280-281
Created by: amwilliamson