### Chapter 9 Vocabulary Project

Brandon Nguyen

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 mode a table that lists items together according to the number of times, or frequency, that the item occurs median a number line with marks or dots that show frequency stratified sample the difference between the greatest and least values in a data set quartile a graph to organize and display data so that the frequencies can be compared convenience sample a bar graph that compares two related sets of data histogram the description of the relationship between two data sets outlier a diagram that is used to show relationships between sets correlation the spread of values in a set of data mean the sum of a set of data divided by the number of items in the data set; also called average systematic sample the entire group of objects or individuals considered for a survey double-line graph a bar graph that shows the frequency of data within equal intervals scatter plot a graph that displays the highest and lowest quarters of data as whiskers, the middle two quarters of the data as a box, and the median double-bar graph a graph with points plotted to show a possinle relationship between two sets of data variability a graph that shows how two related sets of data change over time sample a sample in which each individual or object in the entire population has an equal chance of being selected population the bumber or numbers that occur most frequently in a set of data; when all bumbers occur with the same frequency, we say there is no mode box-and-whisker plot a sample that does not fairly represent the population frequency table a value much greater or much less that the others in a data set random sample a sample of a population that is made up of members that choose to be in the sample range sampling the most available subjects in the population to obtain quick results stem-and-leaf plot a part of the population voluntary response sample a sample of a population that has been selected using a pattern line plot the middle number or the mean (average) of the two middle numbers in an oredered set of data venn diagram three values, one of which is the median, that divide a data set into fouths. See also first quartile, third quartile biased sample a sample of a population that has been divided into subgroups

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