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# Inferences

### Probability and Statistics

TermDefinition
Box-and-Whisker Plot A special type of diagram showing Quartiles 1, 2, and 3 in a box, with lines extending to the lowest and highest values
Frequency the number of times an event occurs in an experiment
Histogram a graphical display where the data is grouped into ranges (such as 100-149, 150-199, etc.) and then plotted as bars
Inter-Quartile Range IQR a measure of variability, based on dividing a data set into quartiles; Q3-Q1
Maximum Value The largest value.
Mean The Arithmetic Mean is the average of the numbers: a calculated "central" value of a set of numbers. To calculate it: • add up all the numbers, • then divide by how many numbers there are.
Measures of Center Any of several methods used to find a "central value" of two or more numbers.
Measures of Spread Measures of spread describe how similar or varied the set of observed values are for a particular variable (data item). Measures of spread include the range, quartiles and the interquartile range, variance and standard deviation.
Median The "middle" of a sorted list of numbers. To find the Median, place the numbers in value order and find the middle number.
Minimum Value The smallest value.
Mode The number which appears most often in a set of numbers.
Mutually Exclusive Events that can't happen at the same time.
Outlier A value that "lies outside" (is much smaller or larger than) most of the other values in a set of data.
Range The difference between the lowest and highest values.
Sample A selection taken from a larger group (the "population") that will, hopefully, let you find out things about the larger group. Samples should be chosen randomly.
Created by: msrandolph

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