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Exam 2 Statistics Study Guide
Continuous variables: can assume all values between any two given
values of the variables (ex. heights of adult men, body temp. of rats, and
cholesterol levels of adults). These are bellshaped—approx. normally
distributed variables. AKA normal distribution.
Neg.
Norm
Pos.
Symmetric Dist.: data values are
evenly distributed about the mean. Neg/left
(Tail of the curve indicates direction of skew)
Skewed: mean is to the left of the median, the mean and the median are to the left of
the mode, majority of data is right to mean
Pos./Right skewed: majority of data to left of the mean, mean is right to the median,
median and mean fall right of mode
NORMAL DIST:
continuous symmetric bellshaped distribution of variable. Study
variables that are not perfectly normally dist. but approx normal. Shape depends on two
things: mean and SD. larger the SD the more distributed, Mean= diff positions on x axis.
STANDARD NORMAL DIST:
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 Spring '12
 stolove

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