SOLUTION: A random sample of 156 fields of durum wheat has a mean yield of 26.8 bushels per acre and a standard deviation of 8.0 bushels per acre. Create a confidence interval 99%. Find a) t

Algebra ->  Probability-and-statistics -> SOLUTION: A random sample of 156 fields of durum wheat has a mean yield of 26.8 bushels per acre and a standard deviation of 8.0 bushels per acre. Create a confidence interval 99%. Find a) t      Log On


   

Question 1086332: A random sample of 156 fields of durum wheat has a mean yield of 26.8 bushels per acre and a standard deviation of 8.0 bushels per acre. Create a confidence interval 99%. Find a) the Margin of Error, b) the confidence interval (written as an inequality), c) the critical values and d) state whether it was a z or t distribution that you used.
Answer by stanbon(75887) About Me  (Show Source):
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A random sample of 156 fields of durum wheat has a mean yield of 26.8 bushels per acre and a standard deviation of 8.0 bushels per acre. Create a confidence interval 99%.
Find:
a) the Margin of Error
ME = 2.5758*8/sqrt(156) = 1.65
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b) the confidence interval (written as an inequality)
26.8-1.65 < u < 26.8+1.65
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c) the critical values:: 2.5758
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d) state whether it was a z or t distribution that you used.
Ans:: z
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Cheers,
Stan H.
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