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

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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
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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