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Hawkes Learning https://learn chapter eight test g.com/Portal/Test/test taketeste O Turn in Test ARIEL WAGONER Question 3- of 7 Step 2 of 2 00:46:45 A random sample of 6 fields of durum wheat has a mean yield of 45.5 bushels per acre and standard deviation of 7.43 bushels per acre. Determine the 80% confidence interval for the true mean yield. Assume the population is approximately normal. Step 2 of 2: Construct the 80% confidence interval. Round your answer to one decimal place. Answer(How to Enter) 2 Points E Keypad Nex Prev 058 A ©201 7 Hawkes Learning

Explanation / Answer

n = 6 x' = 45.5 s = 7.43

z for 80% = 1.28

Let the interval be (a,b).

a = 45.5 - 1.28 * 7.43 / 6 = 41.6174

b = 45.5 + 1.28 * 7.43 / 6 = 49.3826

The interval is (41.6, 49.4).

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