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Unformatted text preview: ECON 2843 010 Name KEY Exam 2 ID # Spring 2005 Lab Instructor Form A Lab Meeting Time Students must show all work on problems that involve calculation, even if the answer is multiple choice. 1. The designers of a universitys website have found that the download time is approximately normally distributed with a mean of 7 seconds and a standard deviation of 2 seconds. What is the probability that a given user will experience a download time greater than 10 seconds? a. .0668 * b. .2514 c. .7486 d. .9332 e. 1.50 2. Refer to question 1. If a random sample of 14 user downloads are selected, what is the probability that the sample variance will be greater than 7.6123? ____.025_____ ____ 1 Questions 3 - 5 refer to the following: Saxon Home Improvement Company is a large distributor of wholesale home improvement supplies. A sample of 100 sales invoices is selected from the population of sales invoices during the month and the sample mean of the 100 sales invoices is $110.27. The population is...
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- Spring '08