Exam 2a Fa 05 KEY

# Exam 2a Fa 05 KEY - ECON 2843 010 Exam 2 Fall 2005 Form A...

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ECON 2843 – 010 Name KEY Exam 2 ID # Fall 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. Questions 1 – 3 refer to the following. The gestation periods for calves can be represented by the normal distribution with a mean of 281 days and a standard deviation of 5 days. Assume that the actual gestation periods for the next 60 calves to be born is a random sample from this population. 1. What is the probability that the mean of this sample will lie between 279 and 280 days? a. .0596 * b. .0761 c. .20 d. .9239 e. .9404 2. What is the probability that the sample mean for the 60 calves will differ from the population mean by more than 1 day? ______.121___ ____ 1

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3. The probability is .05 that the sample variance will be less than what number? (Note: Use the closest row in the table to approximate the degrees of freedom.) a. .90 b. 4.28 c. 6.57 d. 18.3 * e. 43.19 Questions 4 - 5 refer to the following: A survey was taken of U.S. firms regarding the number of years that they have been trading with firms in India. A random sample of 44 responses to this question yielded a mean of 10.455
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