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Chapter

# PSYC 2310 Chapter Notes -Normal Distribution, Descriptive Statistics, Statistical Inference

by OC25636

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- Descriptive statistics- summarize and describe the

characteristics of a set of scores

- Frequency distribution- shows how many participants received

each score

oShows certain characteristics of the data

- Histogram- graph of a frequency distribution

- Measures of central tendency- describe a distribution in terms

of a single statistic that is in some way typical of the sample

as a whole

oMode- most frequently occurring score

oMean- the average of a set of scores (adding up all the

scores and dividing by the number of scores)

oMedian- point that divides the distribution in half when

the individual scores are arranged from lowest to

highest

- Measures of variability- provide information about the spread

of scores in a distribution

- Range- difference between the highest and lowest score in a

distribution

- Deviation score- measures the distance between each core

and the mean

- Variance- the average of the squared deviation scores about

the mean

- Standard deviation- square root of the variance

- Normal curve- symmetrical bell-shaped curve that represents

a theoretical distribution of scores in the population

o50 percent of the cases fall on each side of the mean

and the median and mode have the same value as the

mean

oStandard deviation can be used to divide the normal

curve into the areas containing known percentages of

the population

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