409Exam1Bans - STAT 409 Fall 2011 Version B Name ANSWERS ....

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STAT 409 Fall 2011 Version B Name ANSWERS . Exam 1 Page Earned / 70 Be sure to show all your work; your partial credit might depend on it. Put your final answers at the end of your work, and mark them clearly. No credit will be given without supporting work. The exam is closed book and closed notes. You are allowed to use a calculator and one 8½" x 11" sheet with notes. 1 2 3 4 5 6 Total ___________________________________________________________________________ Academic Integrity The University statement on your obligation to maintain academic integrity is: If you engage in an act of academic dishonesty, you become liable to severe disciplinary action. Such acts include cheating; falsification or invention of information or citation in an academic endeavor; helping or attempting to help others commit academic infractions; plagiarism; offering bribes, favors, or threats; academic interference; computer related infractions; and failure to comply with research regulations. Rule 33 of the Code of Policies and Regulations Applying to All Students gives complete details of rules governing academic integrity for all students. You are responsible for knowing and abiding by these rules.
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Page 1 of 6 1. In a random sample of 11 ½-pound” burgers at Burger Queen , the average weight of beef was 7.9 ounces with the sample standard deviation 0.12 ounces. (Assume the weights are normally distributed.) a) (5) Construct a 95% confidence interval for the overall average weight of beef in a ½-pound” burger at Burger Queen . X = 7.9. s = 0.12. n = 11. α = 0.05. σ is unknown. The confidence interval : X t s ± α 2 n . α 2 = 0.025. number of degrees of freedom = n - 1 = 11 - 1 = 10. t α 2 = 2.228. 11 12 . 0 228 . 2 9 . 7 ± 7.9 ± 0.08 ( 7.82 , 7.98 ) b) (5) Construct a one-sided 90% confidence interval which gives an upper bound for the overall standard deviation of the weights of beef in a “ ½-pound” burger at Burger Queen . ( ) -
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409Exam1Bans - STAT 409 Fall 2011 Version B Name ANSWERS ....

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