Module 7 Vocabulary

Term – (Informal Definition) – Formal Definition

All formal definitions are from http://encyclopedia.thefreedictionary.com

 Histogram – (a bar graph representing a data set) – a statistical graph that represents the frequency of values of a quantity by vertical rectangles of varying heights and widths

 

http://quarknet.fnal.gov/toolkits/new/histograms.html

Mean – (the average of a number set) – mean is the sum of the observations divided by the number of observations

Example: 2 + 7+ 9 = 18; 18/3 = 6

 

http://www.mathsisfun.com/definitions/mean.html

 Median – (the middle number of a data set when arranged from least to greatest) –  the number separating the higher half of a sample, a population, or a probability distribution, from the lower half.

 http://www.mathsisfun.com/definitions/median.html

Mode – (the most frequent number in a data set) – The number or range of numbers in a set that occurs the most frequently

 http://www.mathsisfun.com/definitions/mode.html

 Frequency Distribution – (the tally of numbers from a sample) – a list of the values that a variable takes in a sample. It is usually a list, ordered by quantity, showing the number of times each value appears.

               Frequency Distribution for High Temperatures

 Temperature  Tally   Frequency

 51                   ////          4

 50                   ////          4

 49                   //////        6

 48                                  0

 47                   ///           3

 46                   ///           3

example data from: http://www.mnstate.edu/wasson/ed602lesson3.htm

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