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Statistics Review and Measurement

# Statistics Review and Measurement - Statistics Review...

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Statistics Review Statistics Review Measures of Central Tendency - describe the most typical response to a question . M Mode - the value that occurs most often e Median - the value in the middle of an ordered set of numbers. e Mean - the arithmetic average

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Responses to a Satisfaction Question * 9 point scale, 1 = very dissatisfied, 9 = very satisfied Group 1: 5 4 5 5 6 5 Group 2: 3 1 2 8 8 8 Compute the mode, median, and mean for both Groups What do you notice about Group 2? Statistics Review Statistics Review
Responses to a Satisfaction Question * 9 point scale, 1 = very dissatisfied, 9 = very satisfied Group 1: 5 4 5 5 6 5 Group 2: 3 1 2 8 8 8 Statistics Review Statistics Review Statistics 6 6 0 0 5.0000 5.0000 5.0000 5.5000 5.00 8.00 Valid Missing N Mean Median Mode GROUP1 GROUP2

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Higher variance = a larger spread to the data Group 1 = small variance value Group 2 = large variance value The mean and other measures of central tendency are not very accurate when there is high variability and small sample size. These are sometimes called outlier values Fortunately, we can estimate variability which is nothing more than the spread of the data ! Statistics Review Statistics Review
- give an estimate of how close the values are to the most “typical” response Frequency chart - graphically shows the spread of the data (like a bar chart). Range

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Statistics Review and Measurement - Statistics Review...

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