exam3a-s97

# exam3a-s97 - Exam 3A Course : MSCI 3700 Name: S.S.N.:...

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Exam 3A Course : MSCI 3700 Name: Semester : Spring 97 S.S.N.: Instructor: Dr. Spalding

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1. An operation manager at an electronics company wants to test their amplifiers. The design engineer claims they have an average output of 295 watts with a standard deviation of 17 watts. If the claim is true, in a sample of 50 amplifiers, what is the probability that the mean amplifier output would differ from population mean by less than 5 watts? 1) 0.8314 2) 0.9634 3) 0.9624 4) 0.0045 5) 0.0376 2. Thomson’s is a steel bolt manufacturing company. Their current steel bolts have an average diameter of 0.25 inches and a standard deviation of .0006 inches. If a random sample of 62 steel bolts are selected, what is the probability that the sample mean would be less than 0.2498 inches? 1) 0.4812 2) 0.0149 3) 0.0088 4) 0.0022 5) 0.0044 3. The average length of actual running time (excluding advertisements) for a television feature film is 1 hour and 30 minutes, with a standard deviation of 4.55 minutes. If a sample of 49 TV feature films is selected randomly, what is the probability that the average running time for this sample is 1 hour and 32 minutes or more? 1) 2.33 2) 0.4901 3) 0.001 4) 0.0099 5) 0.0198 4. The average per capita consumption of beer per year is 67 gallons with a standard deviation of 27 gallons. If a sample of 337 persons are randomly selected, what is the probability that the sample mean would be less than 63 gallons? 1) 0.0066 2) 0.9985 3) 0.0033 4) 0.4967
5) 0.9967 Use the following case to answer next two questions. A market research company wishes to know how many liters of milk people over age 17 drink each week. Their consultant thinks that the mean is 7.6 liters of milk per week with a standard deviation of 1.1 liters of milk. 5. How large a sample would be required in order to estimate the

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## This note was uploaded on 03/09/2011 for the course DSCI 2710 taught by Professor Hossain during the Spring '08 term at North Texas.

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exam3a-s97 - Exam 3A Course : MSCI 3700 Name: S.S.N.:...

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