 |  Statistics for the Behavioral Sciences, 4/e Michael Thorne,
Mississippi State University -- Mississippi State
Martin Giesen,
Mississippi State University -- Mississippi State
Measures of Central Tendency
Symbols and FormulasSYMBOLS | Symbol | Stands For |
| | Mo | mode | | Md | median |  <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=gif:: ::/sites/dl/free/0072832517/55314/c5_s1.gif','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (0.0K)</a>]]> | sample mean | | | S | capital sigma, indicates to sum the following values |  <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=gif:: ::/sites/dl/free/0072832517/55314/c5_s2.gif','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (0.0K)</a>]]> | deviation of a score from the mean | | m | population mean, read "mu" |
FORMULAS Formulas 5-1 and 5-2. Equations for computing the sample mean <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=gif:: ::/sites/dl/free/0072832517/55314/c5_f1.gif','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (0.0K)</a>]]>
Formula 5-1 tells you to add all the Xs or scores and then to divide the result by the total number of scores (N). In a frequency distribution, N is the sum of frequencies. Formula 5-2 tells you to multiply each score by its frequency before summing and dividing by N. |
|
2003 McGraw-Hill Higher Education