Chapt.%204

Essentials of Statistics for the Behavioral Science

Info iconThis preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon
    Chapter 4 Variability
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
   
Background image of page 2
    Introduction Variability - how much do individual scores differ from each other in a distribution. Variability is often considered “measurement error” or “statistical error”. The Mean may our best estimate of a characteristic – but it isn’t exact for everyone.
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
    Question
Background image of page 4
    Introduction Different sets of data can have the same mean and still be quite different. A B 10 20 45 28 30 31 12 30 46 29 30 31 13 41 52 29 30 32 16 45 29 31 Mean of Both = 30 Mdn of Both = 30
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
    Potential Measures of Variability Range - The mathematical difference between the highest and lowest values in our distribution. * The range can accurately describe the difference between some distributions but not others. But, the range only takes two values into account. * ADD 1.0 for continuous numbers.
Background image of page 6
    Question
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
  Potential Measures of Variability Deviation Scores - the difference between the individual scores in a distribution and the mean of the distribution. Consider the following set of five numbers:
Background image of page 8
Image of page 9
This is the end of the preview. Sign up to access the rest of the document.

This document was uploaded on 02/18/2011.

Page1 / 19

Chapt.%204 - Chapter4 Variability Introduction Variability...

This preview shows document pages 1 - 9. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online