Spring2011Exam3

Spring2011Exam3 - Spring 2011 FORM H Name Last: _ First: _...

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Spring 2011 FORM H Name Last: ___________________ First: __________________ Exam 3: Chapters 8,9,10 Class Time: ________________________ Directions: Print your NAME and CLASS TIME on THIS EXAM. Print your NAME and CLASS TIME on your SCANTRON. • Write FORM H on your SCANTRON. • Each question has exactly one BEST answer. There are 21 questions. • You may write on this exam. There is no scratch paper allowed. • Each question is worth 5 points for a total of 105 points. This includes 5 bonus points! • If you have no note page, you must write NO NOTES on your SCANTRON. • Put your SCANTRON and PAGE of NOTES inside your EXAM. Before you start packing up your things, turn in your EXAM and SCANTRON. Then go back to your desk to pack up your materials. When your exam is returned, you will get back all materials you turned in. • Turn your cell phone OFF. Any noise from a cell phone will signal that your exam is over. • FAILURE TO FOLLOW ALL INSTRUCTIONS WILL COST YOU THE 5 BONUS POINTS! Questions 1 - 3 refer to the following: After the earthquake and tsunami in Japan damaged the Fukushima nuclear power plant, a random sample of American adults was polled about their opinions on nuclear power. 39% of those polled support building new nuclear power plants. For this problem, assume that the sample included 1000 American adults. http://www.ap-gfkpoll.com/pdf/AP-GfK%20Poll%20March%20Topline%20032911_NUCLEAR.pdf 1. Find the error bound for the true proportion of all Americans who support building new nuclear power plants. Use a 92% confidence level. A. 0.054 B. 0.029 C. 0.022 D. 0.027 2. When planning this study, which two actions could we expect would result in a larger error bound? A. Increase the confidence level and increase the sample size. B. Increase the confidence level and decrease the sample size. C. Decrease the confidence level and increase the sample size. D. Decrease the confidence level and decrease the sample size. 3. In 2009, a similar poll showed that 49% of a sample of 1005 randomly selected American adults supported the building of new nuclear power plants. To test whether the true proportion of all American adults who support building new nuclear power plants has changed between the 2009 survey and the 2011 survey, the most appropriate alternate hypothesis would be: A. Ha: p 2011 p 2009 B. Ha: p 2011 < p 2009 C. Ha: p 2011 ≠ 0 . 49 D. Ha: p 2011 p 2009
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Questions 4 - 8 refer to the following: A website at a university housing office claims that the average rent for a room in shared housing near the university is $726. A new student is concerned that the true average rent is higher. Rents for a random sample of 6 recently advertised rooms in shared housing are shown below. (Assume that the underlying population of rents for individual rooms is approximately normally distributed.)
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Spring2011Exam3 - Spring 2011 FORM H Name Last: _ First: _...

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