Question: 46
(Choose 1 answer)
(See picture)
A. (-0.026, 0.066)
B. (-0.015, 0.055)
C. (-0.015, 0.066)
D. (-0.026, 0.055)
E. None of the other choices is correct
Two different types of injection-molding machines are used to form
plastic parts. Two random samples, each of size 100, are selected, and 5
defective parts are found in the sample from machine 1 while 3 defective
parts are found in the sample from machine 2. Construct a two-sided 90%
confidence interval on the difference in the two fractions defective.
= 1.65.
Let Zo.1
= 1.28 and Z0.05
