Unformatted text preview: population? First, determine the z-value. A 99 percent confidence level is equivalent to p < 0.01. Half of 0.01 is 0.005. The z-value corresponding to an area of 0.005 is 2.58. The interval may now be calculated: The interval is (1.12, 1.18). We have 99 percent confidence that the population mean of pin diameters lies between 1.12 and 1.18 inches. Note that this is not the same as saying that 99 percent of the machine pins have diameters between 1.12 and 1.18 inches, which would be an incorrect conclusion from this test....
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- Fall '08
- 99 percent, 1.15 inches, 1.18 inches, 1.18 inches