(NOTE = show the work for number 1 and 3 in detail )

1. A professor wanted to know if length of class (X) was related to exam scores. Predict someone's exam score if class was 120 minutes long. a = 47, b = 0.21. Round to 2 decimals.

2.Pearson's correlation coefficient is meant to tell you about the __________ and ___________ of a relationship between two variables.

3. A professor wanted to see if length of class (X) was related to exam scores (Y). If r = - 0.385, interpret AND describe the correlation coefficient.

4.Expected values are the count of events that actually happened in real life, whereas observed values are the count of theoretically what we should get in a perfect situation.

a. True

b. False