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13 Cards in this Set

  • Front
  • Back
descriptive stats
used to summarize and describe data - generalizability & external validity
frequency distribution
shows number of times each value for the variable occurs
mode
score that occurs most frequently
median
"middle score" in a rank-ordered distribution
mean
sum of all scores divided by number of scores
measures of central tendency
mode, median, mean
measures of variability
range, variance, standard deviation
range
difference between highest and lowest values in distribution
variance
measure of variability within distribution
standard deviation
square root of the variance
1 standard deviation
one sided: 34%
two sided: 68%
2 standard deviation
one sided: 47%
two sided: 95%
3 standard deviation
one sided: 49%
two sided: 99.9%