We will have a short quiz on Chapter 6 tomorrow, based on the reading, homework, and what has been discussed in class. Tonight, please finish reading chapter 6 (though skip the section on straightening an association for now; the quiz will not include that section).
In class today, watch this video for more on how the correlation coefficient is actually calculated. Note that while this video divides by n, we would always use n-1 (though we will never actually calculate r by hand).
Read pages 163-166, then exercises 27, 28, 29, and 40 from pages 171-173.