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# Chapter 6

### Data Collection and Analysis

TermDefinition
Mean the sum of all the numbers, divided by the number of digits in the data set.
Median the middle value of the data set when the data is in order from least to greatest. If there are an even number of items, then you find the mean of the middle two values.
Mode the value that occurs most often.
Range the difference between the greatest and least values in the data set.
Outlier a value in the set that is very different from the other values.
Box and Whisker Plot a data display that shows how data are distributed by using the median, quartiles, least value, and greatest value.
Quartiles are three values, one of which is the median, that divide a data set into fourths. Each quartile represents 25% of the data.
Variation the spread of values.
Interquartile Range (IQR) the difference between the first and third quartiles.
Frequency the number of times a data value occurs.
Frequency Table tells the number of items an event, category, or group occurs.
Line Plot uses a number line and x’s or other symbols to show frequencies of values.
Histogram bar graph that shows the number of data items that occur within each interval.
Created by: Juchrin