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(Choose 1 answer)
☐ A
(See picture)
A. (0.128. 0.332)
B. (0.144, 0.316)
C. (0.125, 0.335)
☐ E
D. (-0.014, 0.474)
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E. None of the other choices is correct
Two machines are used to fill plastic bottles with dishwashing
detergent. The fill volume can be assumed normal, with standard
deviation σ = 0.15 fluid ounces and σ = 0.20 fluid ounces for
machine 1 and machine 2, respectively. Two random samples of
= 20 bottles from machine 1 and n = 25 bottles from machine 2
are selected, and the sample means are x = 30.85 fluid ounces and
x=30.62 fluid ounces. Construct a 95% two-sided confidence
interval for the difference in mean fill volumes of two machines.
FUO.Sh
sh the exam.
Let
-0.025
=1.96, =0.05
=1.645, 0.025,43 = 2.017, 0.05,43 = 1.681
