Summarizing and Graphing Numerical Data

In this section we will be introduced to techniques for exploring and summarizing numerical variables. Recall that outcomes of numerical variables are numbers on which it is reasonable to perform basic arithmetic operations. For example, the pop2010 variable, which represents the populations of counties in 2010, is numerical since we can sensibly discuss the difference or ratio of the populations in two counties. On the other hand, area codes and zip codes are not numerical, but rather they are categorical variables.

[ailonglong]

These are great companions for the book

[jen]

ithink you should care to explain little more in detail before jumping to the next concept as an introductory video it is hard to grasp a specific concept with mere definitions this could have been gleaned off reading. A few examples would have really made the video worth watching

[Viktxr]

On what basis is outliers defined as such; there is no explanation to this?