You Need to Determine the Population Variance of the Diameters

Multiple Choice

You need to determine the population variance of the diameters of a specialized electronic component you need to use 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) 0.0215 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