Question: 37
(Choose 1 answer)
(See picture)
A. (87.65,93.31)
B. (88.20,92.76)
C. (88.27,92.69)
D. (87.85,93.11)
The yield of a chemical process is being studied. From previous
experience, yield is known to be normally distributed and σ = 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 zo.025 = 1.960; Zo.05 = 1.645.
