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PracticeExam2_1 - Statistics 200 B1 Exam 2 Name_Solutions...

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Statistics 200 B1 Exam 2 Name:_______ Solutions __________________________ Closed book and notes. You are allowed a calculator and one 8.5 x 11 inch sheet (two-sided) of formulas and other information. Please be aware that assisting another student on the exam or receiving assistance from anyone other than the course instructor is a violation of the university’s academic integrity policy and will be penalized.
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1. The diameter of a spindle in a small motor is supposed to be 5 mm. If the spindle is either too small or too large, the motor will not perform properly. Assume the population of spindles produced by a manufacturer is normally distributed with unknown mean μ and standard deviation σ = 0.02 mm. The manufacturer measures a SRS of 16 spindles produced by his company and finds their mean diameter to be x = 5.01 mm. Test H 0 : μ = 5 mm against H a : μ 5 mm. Is the test significant at level .05? 0 . 2 4 / 02 . 0 01 . 0 16 / 5 = = - = σ x z P = P(|Z|>2) < P(|Z|>1.96) = 0.05 (Table A or the z* row of Table D) Therefore, the test is significant at level .05 2. A social psychologist reports that "in our sample, ethnocentrism was significantly higher (P < 0.05) among church attendees than among nonattendees." This means (circle the correct answer): a. Ethnocentrism was at least 5% higher among church attendees than among nonattendees.
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