"Numerical quantities focus on expected values, graphical summaries on unexpected values"

John Tukey's quote is referring to the 2 main kinds of data analysis: mathematical and visual. Numerical analysis focuses on expected worths, which are values that are expected to take place based on the information. This type of analysis is utilized to identify patterns and trends in the information. Visual summaries, on the other hand, concentrate on unexpected worths, which are values that are not expected to happen based upon the data. This type of analysis is used to determine outliers and anomalies in the information.

In summary, John Tukey's quote is stressing the importance of both mathematical and graphical analysis when it comes to data analysis. Mathematical analysis is used to recognize patterns and patterns in the information, while visual analysis is utilized to determine outliers and abnormalities. Both kinds of analysis are necessary for comprehending the information and drawing significant conclusions.