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Across 2. the description of the relationship between two data sets 4. a graph with points plotted to show a possinle relationship between two sets of data 8. a sample of a population that is made up of members that choose to be in the sample 11. a diagram that is used to show relationships between sets 12. a part of the population 13. a graph that shows how two related sets of data change over time 15. a table that lists items together according to the number of times, or frequency, that the item occurs 16. a graph to organize and display data so that the frequencies can be compared 18. a sample that does not fairly represent the population 19. the spread of values in a set of data 20. a number line with marks or dots that show frequency 21. three values, one of which is the median, that divide a data set into fouths. See also first quartile, third quartile 23. a value much greater or much less that the others in a data set 24. a sample of a population that has been divided into subgroups 25. a bar graph that shows the frequency of data within equal intervals

Down 1. a sample in which each individual or object in the entire population has an equal chance of being selected 3. a sample of a population that has been selected using a pattern 5. 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 6. sampling the most available subjects in the population to obtain quick results 7. the sum of a set of data divided by the number of items in the data set; also called average 9. the difference between the greatest and least values in a data set 10. the middle number or the mean (average) of the two middle numbers in an oredered set of data 14. a bar graph that compares two related sets of data 17. the entire group of objects or individuals considered for a survey 22. 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