☑Kizspy.me
(Choose 1 answer)
(See picture)
☐ A
A. 6.729
B. 6.669
☐ E
C. None of the other choices is correct
D. 6.519
E. 6.482
FUO.sh
sh the exam.
Two types of plastic are used for an electronics component. It is
known that the breaking strengths (unit: psi) of plastic 1 and plastic
2 are normal with standard deviation o₁ = 1.7 and 02 =1.4,
respectively. Two random samples of sizes n₁ = 15 and m₂ =12 are
tested, and the sample means are x=170 and x =164.5. Construct a
95% upper confidence bound for the difference in the two population
means ₁₂-
Let =0.025
=1.96, 0.05=1.645, 0.025,25 = 2.06, 0.05,25 = 1.708
