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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 95% confidence interval on the ratio of variances.

With 95% confidence, what is the right-value of the two-sided confidence interval on the ratio of variances?

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Answer #1




n1 = 18
n2 = 16




Lower Limit =
Upper Limit =
95% Confidence interval is ( 0.2562 , 1.9582 )
( 0.2562 < < 1.9582 )

Right value = 1.9582

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