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Name: February 22, 2001 Score:

MATH 147

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Quiz 5

(6 pts.)

Problem 1. Compute the correlation coefficient for the following data:

X	Y
4	-2
2	-1
0	3

(2 pts.)

Problem 2. A student's class grade is based on two tests, a midterm and a final. The correlation of the two grades for a class of 30 people is found to be 0.6, the average midterm and final scores were both 70. It is discovered afterwards that an error was made in the midterm. To correct the error, the instructor decides to add 5 points to everyone's score regardless of whether or not they had the problem correct. What will the new correlation be after the correction?

(2 pts.)

Problem 3. What is your section number? Knowing the time, room, and TA is worth no credit.