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Appendix - Chapter Notes

Course Code
PSYC 2310
Anneke Olthof

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acDifficult to make sense of data merely by individual scores
c data the summarize and describe the characteristics of a set
of scores
c a method of summarizing a set of scores by showing how
many participants received each score
ac3he frequency distribution tells us at a glance about certain characteristics of
the data
J a graph of frequency distribution
Measures of Central 3endency
acîrequency distributions and histograms give us a general picture of how
scores are distributed
accc a distribution in terms of a single statistic that is in
some way Ǯtypicalǯ of the sample as a whole
a occurs most often
a average
a the point that divides the distribution in half when ordered from lowest o
Measures of Variability
acc provide information about the spread of scores in a
 the difference between the highest and the lowest score in distribution
cc  the square root of the variance
!c a symmetrical bell-shaped curve that represents a theoretical
distribution of scores in the population
3he Correlation Coefficient
acÔelations between variables can differ in direction and in strength
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