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Statistical Analysis
every set of data collected needs some summary information developed that describes the numbers it contains
-Central tendency and dispersion
- relationships of the sample data
- hypothesis testing
Measures of Central Tendency
MEAN, MEDIAN, MODE
Mean
-the arithmetic average of sample
-all values of a distribution of responses are summed and divided by the number of valid responses
Median
-exactly half of the responses are above and half are below the median value
Mode
-the most common value in the set of responses to a question
- the response most often given to a question
Measures of Dispersion
RANGE, STANDARD DEVIATION, AND VARIANCE
Range
the distance between the smallest and largest values in set of responses
Standard Deviation
the average distance of a distribution values from the mean
varience
the average squared deviation about the mean of a distribution of values
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