Introduction to summary statistics: The sample mean and median

Statistical Thinking in Python (Part 1)

Justin Bois

Teaching Professor at the California Institute of Technology

2008 US swing state election results

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¹ Data retrieved from Data.gov (https://www.data.gov/)

ch2-1_v2.004.png

¹ Data retrieved from Data.gov (https://www.data.gov/)

import numpy as np
np.mean(dem_share_PA)

45.476417910447765

$$mean = \bar{x} = \frac{1}{n}\sum_{i=1}^{n}x_i$$

Data points whose value is far greater or less than most of the rest of the data

ch2-1_v2.014.png

¹ Data retrieved from Data.gov (https://www.data.gov/)

ch2-1_v2.015.png

¹ Data retrieved from Data.gov (https://www.data.gov/)

ch2-1_v2.018.png

¹ Data retrieved from Data.gov (https://www.data.gov/)

np.median(dem_share_UT)

22.469999999999999

Statistical Thinking in Python (Part 1)