The intentions of this chapter were to introduce readers to measures of central tendency, dispersion, and statistical hypothesis testing. While the arithmetic mean, median, and mode are the most popular measures of central tendency, t-tests and z-tests may be the most popular statistical tests used. This chapter also taught you how to design your own function to run a z-test, and how to recover it from local files or the cloud. A/B tests were also covered.

In the next chapter, we will cover what data wrangling is and how to use it in R.