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January 25, 2015

January 25, 2015

Posted by **Kevin** on Sunday, October 21, 2012 at 11:08pm.

4-1) (2 marks) What is the slope of the least-squares regression line of pre-exam total scores on final exam scores in this course? What is the intercept?

4-2) (1 mark) Use the regression line to predict Mary’s pre-exam total scores.

4-3) (2 marks) Mary doesn’t think this method accurately predicts how well she did on the pre-exam. Calculate r2 and use the value you get to argue that her actual score could have been much higher or much lower than the predicted value.

- Statistics -
**Ray**, Tuesday, October 23, 2012 at 2:10amSuppose there are two defective items in a pool of five items. You want to test one

item at a time until you identify the second defective item. Find following probabilities

a. You need four tests. (i.e. The second defective item will be found at the fourth

test.)

b. You need at most three tests.

c. Given the second test found at the third test, what is the probability that you

found the first defective at the first test?

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