The primary property of the alloys used for teeth filling, Ask an Expert

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The primary property of the alloys used for teeth filling is the percent of shrinkage on driving. For a certain alloy 45 test specimens showed an avarage shrinkage percentage of 18.4 and a variance of 1.44.

a) Estimate the true avarage percentage of shrinkage for specimens of this type in 98% confidence interval.

b) How large a sample size is necessary if the length of 98% interval is to be 0.4?

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