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population a group of people you want to know more about
samples represents entire population
biased sample a sample that is not representative of the population
random sample randomly chooses from the population who will be in the surveys, not likely to be biased
stratified random sample breaks people up into groups. not likely to be biased
systemic sample follows a rule. potentially biased
convenience sample a lazy sample, picks people that are easy to get. likely to be biased
self selected sample volunteers to be in sample. likely to be biased
mode number that repeats the most in a set of data
median the middle number in a group of data when numerically arranged
mean average
range difference between the largest and smallest number
mean absolute deviation a measure of dispersion along with range
central tendency mode median and mean
two way frequency table divides data into categories across the top and down the side
joint frequencies body of the table
marginal frequencies rows and column totals
stem and leaf plots displays data that organizes it based on their digits
histograms displays data from a frequency table
box and whisker plots organizes data values into groups
Created by: gabbypowell