Transforming Data
Measures of Center
Measures of Center
Measures of Center change when data is added, subtracted, multiplied, or divided.
Measures of Spread
Measures of Spread
Measures of spread change only when data is multiplied or divided.
Example:
Example:
mean: 17 median: 18 IQR: 5 SD: 3.4 range: 13
add 2 to each data point
mean: 19 median: 20 IQR: 5 SD: 3.4 range: 13
multiply each data point by 3
mean: 57 median: 60 IQR: 15 SD: 10.2 range: 39
x/5 - 3
mean: 8.4 median: 9 IQR: 3 SD: 2.04 range: 7.8