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2005-Spring-Final

# 2005-Spring-Final - ISMT111 Business Statistics(L1 L2 Final...

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Final exam May 26, 2005 Directions 1. There are 6 pages in this examination paper (including this). Check to make sure you have a complete set and notify the invigilator immediately if part of it is missing. 2. Key formulas and statistical tables ( z and t ) are provided separately. 3. Calculator may be used in this examination. 4. You are given 3 hours to complete this examination. Do not begin until you are told to do so. 1

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Answer the following questions, please provide steps that supports you answers 1. (15pts) A large public utility company wants to compare the consumption of electricity during the summer season for single-family houses in two counties that it serves. For each household sampled, the monthly electric bill is recorded with the following results: County I County II n 25 25 X \$115 \$98 s \$30 \$25 Let 1 be the mean utility bill in county I and 2 be the mean utility bill in county II. (b) What assumption was made in (a)? (c) Find the p-value in the testing in (a) (d) Is there evidence that the mean monthly bill is higher in county I than in county II at 0.05 level (e) What assumption was made in (b)? county I and county II. 2. (12pts) The New York Times reported a study conducted by researchers concerning the role of media in the lives of children. In one question of the study, children were asked if they use a computer each day. From a sample of 1090 children between the ages of 2 and 7, 283 used a computer each day. From a sample of 2065 children between the ages of 8 and 18, 1053 used a computer each day. Let
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2005-Spring-Final - ISMT111 Business Statistics(L1 L2 Final...

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