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Two types of plastics are suitable for use by an electronics component manufacturer. The breaking strength...

Two types of plastics are suitable for use by an electronics component manufacturer. The breaking strength of these plastics is very important. From a random sample size of n1=18, and n2=16, we obtained that X1-bar=151.2, S1=1.4 and X2-bar=152.3, S2=1.65.

Calculate a 90% confidence interval on the difference in means.

With 90% confidence, what is the left-value of the two-sided confidence interval on the difference in means?

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Answer #1

90% CI for difference: (-1.986, -0.214)

left-value = -1.986

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