 # Regression: Introduction–Question 1

Imagine now that you were asked to predict how a student in another class would perform.

 Grade % obtaining grade A (90 – 100 pts) 10% B (80 – 89 pts) 15% C (70 – 79 pts) 50% D (60 – 69 pts) 15% F (0 – 59 pts) 10%

Question 1: Given no other information, what would be your best guess of the grade of any randomly selected person in the class?

#### A: 90 – 100 pts

Incorrect

Only 10 percent of the students in the class earned an A. If we randomly selected 1 student it is relatively unlikely that that that person earned an A.

#### B: 80 – 89 pts

Incorrect

Only 15 percent of the students in the class earned a B. If we randomly selected 1 student it is relatively unlikely that that that person earned a B.

#### C: 70 – 79 pts

Correct

The middle of the grade distribution is a C and 50% of the class received a C grade, so a grade of C is our best guess. .

#### D: 60 – 69 pts

Incorrect

Only 15 percent of the students in the class earned a D. If we randomly selected 1 student it is relatively unlikely that that that person earned a D.

#### F: <60 pts

Incorrect

Only 10 percent of the students in the class earned an F. If we randomly selected 1 student it is relatively unlikely that that that person earned an F.

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