descriptive statistics
o :## statistics that summarize the data collected in a study
measures of central tendency
o :## mean, median, mode
measures of variability
o :## range, variance, standard deviation
Mode
o :## the most frequently occurring score(s) in a distribution
Median
o :## the ...
RPE exam Questions and Answers
descriptive statistics
o :## statistics that summarize the data collected in a study
measures of central tendency
o :## mean, median, mode
measures of variability
o :## range, variance, standard deviation
Mode
o :## the most frequently occurring score(s) in a distribution
Median
o :## the middle score in a distribution; half the scores are above it and half are
below it
mean
o :## average
range
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o :## the difference between the highest and lowest scores in a distribution
standard deviation
o :## average distance of a score from the mean
Variance
o :## standard deviation squared. Mean of squared deviation scores
scales of measurement
o :## nominal, ordinal, interval, ratio
nominal scale
o :## Naming scales. Observations are labeled and categorized
Ordinal scale
o :## Ranking scale, consists of separate categories that are arranged in rank order
interval scale
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o :## Consists of ordered categories that are all intervals of exactly the same size.
Allows us to measure how much difference exists between measurements. The
zero point on an interval scale is arbitrary and does not indicate a zero amount of
the variable being measured.
ratio scale
o :## interval scale with an absolute zero (nothing). Numbers reflect ratio of
magnitude (can use twice) (time is always ratio)
real limits
o :## the boundaries of intervals for scores that are represented on a continuous
number line
normal distribution
o :## A function that represents the distribution of variables as a symmetrical bell-
shaped graph.
positively skewed distribution
o :## A distribution where the scores pile up on the left side and taper off to the
right.
negatively skewed distribution
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