Chap 12 - measures of central tendency, measures of spread Flashcards
what is mean & how do you get it
-average
-add data/ by no. of data
what is median & how do you get it
-exact middle of the data
-rewrite data in ascending order
-nth = no. data
-nth +2/2 = term
what is mode & how do you get it
-the most frequent
-good for lots of data
what is range & how do you get it
-highest score - lowest score
-not frequency
what is standard deviation & how do you get it
-how far data is away from mean
what are grouped data for measures of central tendency
-mean = mean class
-median = median class
-mode = modal class
why is median found
its robust
what are measures of central tendency
-mean
-median
-mode
what are measures of spread
-range
-standard deviation
how to find mean class
-find middle of class range by adding the 2 no.s & dividing by 2
-times the middle of each class by it’s frequency & add them
-divide by total frequency
where is lower quarter from
median to lowest score
where is upper quarter from
median to highest score
what is interquartile range
upper quarter - lower quarter
where is 50% of data in a box whisker plot
interquartile range
where is 25% of data in box whisker plot
upper quarter & lower quarter
