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math
vocab
Term | Definition |
---|---|
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 |