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stat_book_pset9_spring08

# stat_book_pset9_spring08 - Book PS#9 6.10 To clarify the...

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Book PS #9 6.10 To clarify the question, the population standard deviation σ = \$90. Round your answers to four decimal places. 6.24 Remember to express your answer as a whole number. 6.28 a) Round your answers to four decimal places. b) Remember to express your answer as a whole number. #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. Do you reject H 0 at the 5% level? #2) Statistics can decide the authorship of literary works. Sonnets by a certain Elizabethan poet are known to contain an average of μ = 6.9 new words (words not used in the poet’s other works).
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