section_problems_10_fall11

section_problems_10_fall11 - Section Problems#10 from book...

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Section Problems #10 from book: 6.22 (page 358) To clarify the question, the population standard deviation σ = $290. Round your answers to four decimal places . Also answer this question: In Exercise 6.22, what is the smallest sample size that would achieve a margin of error $50 with 99% confidence? Remember to express your answer as a whole number. 6.34 (page 360) a) Round your answers to four decimal places . b) Remember to express your answer as a whole number. 6.35 (page 360) #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 farmers surveyed are an SRS from the population of all commercial corn growers and that the standard deviation of the yield in this population is σ = 10 bushels per acre. We want to test: H 0 : μ = 120 H a : μ 120 Give the z test statistic and its P-value. Round your answers to four decimal places .
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