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# Data Management

### Data Collection, Representation and Analysis

TermDefinition
range the difference between the highest number and the lowest number
data Information
Population Entire group being considered for survey
Sample Part of the population being surveyed
histogram A bar graph representing frequency distribution for certain ranges or intervals. No Gaps between bars.
bar graph Compares data values (no intervals).
line graph uses lines to join points which represent the data over time
scatter plot a graphical diagram with points plotted to show a relationship between two variables
outlier a value far away from most of the data in a set of data
box and whisker (box plot) a diagram or graph using a number line to show the distribution of a set of data; displays the median, upper and lower quartiles, and the maximum and minimum values of the data
pie graph or circle graph a graph using a divided circle where each section represents part of the total
Mean Average. Add up all the numbers and divide by how many numbers there are.
Median Put all numbers in order from smallest to largest, then find the middle number. If there are two numbers in the middle, add them up and divide by two.
Mode The number that occurs the most.
Bar Graph a graph that uses vertical or horizontal bars to show comparisons among two or more items
Double Bar Graph a display used to show two sets of related data with vertical or horizontal bars
Scatter Plot A graphed cluster of dots, each of which represents the values of two variables. The slope of the points suggests the direction of the relationship between the two variables. The amount of scatter suggests the strength of the correlation
Distribution A way to show the arrangement of data values