PLS 210-A01

*** 1-HR EXAM TMW, CLOSED-BOOK/NOTES ***

GET CALCULATOR OUT OF BASEMENT BOX!

Test review:
overhead projections taken from exercises in text – labeling variables, numerous tables
transparencies displayed were copied from textbook, appx. pg.60

BE ABLE TO APPLY KEY TERMS: Ratio/interval (these two will be combined), ordinal, nominal
Determine what kind of data we’re really looking at

~~~~~ END EXAM REVIEW, NEW MATERIAL BELOW ~~~~~~~

Measures of central tendency:

mathematical mean (X-bar, Y-bar, etc)
geometric mean
harmonic mean
(these two will not be used)
median (Md.) =
mode (Mo.) =

Y-bar is typically dependent, X-bar is typically independent (written with bar above)

x=
10
15
20
45
50
n=5

average 140/5=28

Sigma: Σ (capitalized, used as “summation” symbol — think MS-Office “autosum” button)

array of scores

formal definition of “mean:”

Xi =
10
15
20
45
50
X-bar =
28
28
28
28
28
Xi – X-bar =
-18
-13
-8
17
22
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