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40 measurements were made of the concentration of ash in a certain variety of product. The sample mean was 19.35 and the standard deviation was

40 measurements were made of the concentration of ash in a certain variety of product. The sample mean was 19.35 and the standard deviation was .577.

a)Find a 90% confidence interval for the concentration of ash.

b)Find a 95% confidence interval for the concentration of ash.

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