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Answer (Choose 1 answer)
(See picture)
A. (88.20.92.76)
Β. (87.85.93.11)
C. (88.27.92.69)
D. (87.65,93.31)
The yield of a chemical process is being studied. From previous experience, yield is known to be normally distributed and o = 3. The past 5 days of plant operation have resulted in the following percent yields:91.6, 88.75, 90.8, 89.95, and 91.3. Find a 95% two-sided confidence interval on the true mean yield.
Let Z0.025 1.960; 20.05 1.645.
the exam.
