problemset6solution - PAM 2100 Problem Set #6 Spring 2009...

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PAM 2100 Problem Set #6 Spring 2009 Answer Key Solve the following problems from the textbook: 6.20 (2 points) To clarify the question, the population standard deviation σ = $220. Round your answers to four decimal places. Ans. For 95% Confidence interval, the corresponding value of 96 . 1 = z . So the C.I. is 3574 . 136 1400 10 220 * 96 . 1 1400 ± = ± (1 point for the correct value of z-star. One point for the correct final answer) 6.31 (2 points) Remember to express your answer as a whole number. For 90% Confidence interval, the corresponding value of 645 . 1 = z So, 53 39 . 52 ) 50 220 * 645 . 1 ( ) ( 2 2 = = = m z n σ (1 point for the correct value of z-star. One point for the correct final answer) Also solve the following problems: #1) The mean yield of corn in the US is about 120 bushels per acre. A survey of 40 farmers this year gives a sample mean yield of x = 123.8 bushels per acre. We want to know whether this is good evidence that the national mean this year is not 120 bushels per acre. Assume that the
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problemset6solution - PAM 2100 Problem Set #6 Spring 2009...

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