STAT 3321 – Final, Spring, 2007 – Green Exam - Printed Name_______________________

By signing below I state that I understand that academic dishonesty can result in punishment resulting in at least a zero on this test and could include expulsion from the university and that all the work on this exam is mine.

Directions
1. Do not open exam until told.
2. Bubble in your last name, skip a space, and then your first name on the scantron.
3. Set all pagers and cell phones to silent and place on floor or backpack
4. When finished place your printed material inside your exam and place on desk in front.
5. Check the board for corrections to the exam before leaving.
6. You can not use your phone as a calculator.
7. Assume a = 0.05 and 95% confidence unless told otherwise.

I have read and I understand all the directions above.

_____________________________________________
Signature

1 Suppose P(A) = 0.35. The probability of the complement of A is:
a. 0.35
b. 0.65
c. 0.50
d. 0.35
e. 0.05

2 If P(A) = 0.35, P(B) = 0.45 and P(A and B) = 0.25, then P(A|B) is:
a. 0.714
b. 0.556
c. 1.4
d. 1.8
e. 0.45/0.35

3 You are trying to predict the starting salary of students based on their GPA. You find a 95% the population intercept is 25,000 with a margin of error of ±2,000 . Which of the following is a correct interpretation of the interval values? With 95% confidence we can say that ….
a. for each one point increase in GPA, the average starting salary is 25,000 with a margin of error of ±2,000.
b. I haven't the foggiest idea what this means. (This might be true, but this answer will still be counted wrong.)
c. when the starting salary is zero, a student’s GPA will be between $25,000.
d. when GPA is zero, the average starting salary increases by 25,000 with a margin of error of ±2,000.
e. when GPA is zero, the average starting salary is