ECON 250 Midterm: ECON 250 Pastmidterm2 midterm nov 2008 ans

• School: Queen's University
• Department: Economics
• Course: ECON 250
• Professor: All

Document Summary

At the end of the exam are several formulae and the binomial cumulative tables. Answers are to be written in the examination booklet. Most of the marks are awarded for showing how a calculation is done and not for the actual calculation itself! There are a total of 100 possible marks to be obtained. Do all 8 questions: (30 marks, 5 each) suppose that sales (s) at a store are independently normally distributed with mean of 100 and a variance of 9. (a) what is the p (97 < s < 102) P (97 < s < 102) = p 97 100. = p ( 1 < z < . 67) = (f (. 67) . 5) + (f (1) . 5) 3 (b) what is the p (97 < s10 < 102) where s10 is the sample mean with 10 observations. P (97 < s10 < 102) = p .