Midterm 2 Solutions 2014 - Midterm Exam Instructor Tessa...

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Stat 20 Midterm Exam Instructor: Tessa Childers-Day 1 May 2014 Please write your name and student ID below, and circle your section. With your signature, you certify that you have not observed poor or dishonest conduct on the part of your classmates. You also certify that you have not been a party to poor or dishonest conduct, and that the work on this exam is solely your own. Please show your work ONLY in the area provided. Work outside of this area will not be considered for credit. Name: Student ID: Signature: Date: Section: 101 (10am-11am) 102 (11am-12pm) 103 (1pm-2pm) 104 (1pm-2pm) 105 (2pm-3pm) 106 (3pm-4pm) 107 (4pm-5pm) 108 (5pm-6pm) Answer the questions in the spaces provided. There are questions on the front and back of each page. This midterm covers the material from Lectures 1 through 13, and Homeworks 1 through 6. Show your work, including labeling quantities (such as z-scores). The clearer that your work is, the easier it is to award partial or full credit. If you do not show your work, you will not receive credit. You are welcome to leave your answers as fractions. If you use decimals, please round all answers to two significant figures, and hold your rounding until the final calculation. Please show your work ONLY in the area provided. Work outside of this area will not be considered for credit. Question Points Score 1 12 2 12 3 12 4 12 5 12 Total: 60
Stat 20 Midterm Exam, Page 2 of 9 1 May 2014 1. Pat the journalist sees a story in the media stating that the average mobile phone bill in America is $100 per month. Pat believes that the American subscribers of a major magazine pay less per month for their mobile phones than this. Pat seeks your help (as a statistician) to clarify this belief and aid in writing a story. (a) (3 points) State the null and alternative hypotheses in terms of the problem. What kind of test will you use, and why? Is your test one-sided or two-sided, and why?

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