<PRE><B>Question 1086332</B>
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 &lt; u &lt; 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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