Question 2-1 of 5 Step 1 of 2 93:22:56 A random sample of 41 fields of barley ha

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Question 2-1 of 5 Step 1 of 2 93:22:56 A random sample of 41 fields of barley has a mean yield of 24.4 bushels 99% confidence interval for the true mean yield. Assume the population is normally distributed. step 1 of 2: Find the critical value that should be used in constructing the confidence interval. Round your answer to three decimal places per acre and standard deviation of 8.09 bushels per acre. Determine the Answer(How to Enter) 4 Points Keypad Next Prev 2017 Hawkes Learnin Type here to search

Explanation / Answer

Mean is 24.4 and s is 8.09

for n of 41, the standard error SE is s/sqrt(n)=8.09/sqrt(41)=1.26345

z (critical value) for 99% confidence is given as 2.576

lower limit is mean-z*SE=24.4-2.576*1.26345=21.14535

upper limit is mean+z*SE=24.4+2.576*1.26345=27.65465

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