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PSYC 2310 (200)

Anneke Olthof (30)

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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

accc 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

highest

Measures of Variability

acc provide information about the spread of scores in a

distribution

the difference between the highest and the lowest score in distribution

cc 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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