measures of central tendency Flashcards
summary statistic that represents the center point or typical value of a dataset
measures of central tendency
one of the three statistics indicating average or middlemost score between the extreme scores in a distribution
measures of central tendency
three most often used measures of central tendency
mean, median, mode
statistic at the ratio level of measurement, average, equal to the sum of the observations divided by number of observations
arithmetic mean
mean is denoted by the symbol
x bar
takes into the account of order of scores and is ordinal in nature, middle value
median
nominal in nature, most frequently occurring score
mode
one mode
unimodal
two modes
bimodal
3 or more modes
multimodal
mean is lower than the median, mode > median > mean
negatively skewed (left-skewed)
mean is higher than the median, mode < median < mean
positively skewed, right-skewed