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Unformatted text preview: PSTAT 120C: Practice Questions Midterm on April 30, 2009 The midterm exam is next Thursday during lecture. Please be sure to bring Textbook, One page (a single side of an 8 1 2 11 sheet) with whatever formulas you decide are necessary, Calculator, and Blue book for writing all your answers. Please come early on Thursday because the exam will begin promptly at 9:30 to give everyone as much time as possible. Here are a couple of practice questions. I hope to publish the solutions on Tuesday. 1. Exercises 15.4 and 15.13 on pages 748 and 754 of the seventh edition of the textbook. (15.2 and 15.9 in the sixth edition). 2. The table below shows the price of sugar and the price of eggs at 7 stores from across the country. Store Sugar, x Eggs, y x 2 y 2 x y ( x y ) 2 1 $1.40 $2.00 1.96 4.00$0.60 0.36 2 $1.55 $1.70 2.40 2.89$0.15 .0225 3 $1.85 $1.45 3.42 2.10 $0.40 0.16 4 $0.95 $1.00 0.90 1.00$0.05 0.0025 5 $0.85 $1.90 0.72 3.61$1.05 1.1025 6 $1.00 $1.75 1.00 3.06$0.75 0.5625 7 $1.15 $2.10 1.32 4.41$0.95 .9025 Average $1.25 $1.70 1.68 3.01$0.45 0.44464 It also includes some statistics you can use to answer these questions. (a) Construct a 90% confidence interval for the variance of the difference between the costs of eggs and the cost of sugar....
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 Spring '08
 EduardoMontoya

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