You Need to Determine the Population Variance of the Diameters

question 7

Multiple Choice

You need to determine the population variance of the diameters of a specialized electronic component used for a new product.Other studies indicate that the diameters of this product are roughly normally distributed.You take a sample of 15 units and find out that the sample average diameter is 0.24 mm, and the sample standard deviation is 0.2 mm.What is the 95% confidence interval for the population variance?

• A)0.0214 to 0.0995
• B)0.0230 to 0.1066
• C)0.1466 to 0.3154
• D)0.1666 to 0.3354
• E)0.1866 to 0.3554

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The value below which 75% of the data set falls, marking the upper quarter of data points.

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