A company produces industrial wiring. One batch of wiring is specified to be 2.16 centimeters (cm) thick. A company inspects the wiring in seven locations and determines that, on the average, the wiring is about 2.16 (cm) thick. However, the measurements vary. It is unacceptable for the variance of the wiring to be more than .04 cm2.The standard deviation of the seven measurements on this batch of wiring is .34 cm. Use α = .01 to determine whether the variance on the sample wiring is too great to meet specifications. Assume wiring thickness is normally distributed.
Answer to relevant QuestionsSuppose a null hypothesis is that the population mean is greater than or equal to 100. Suppose further that a random sample of 48 items is taken and the population standard deviation is 14. For each of the following α ...A Harris poll was taken to determine which of 13 major industries are doing a good job of serving their customers. Among the industries rated most highly by Americans for serving their customers were computer hardware and ...According to Zero Population Growth, the average urban U.S. resident consumes 3.3 pounds of food per day. Is this figure accurate for rural U.S. residents? Suppose 64 rural U.S. residents are identified by a random procedure ...According to Gartner Inc., the largest share of the worldwide PC market is held by Hewlett-Packard with 16.0%. Suppose that a market researcher believes that Hewlett-Packard holds a higher share of the market in the western ...In a recent year, published statistics by the National Cattlemen’s Beef Association claimed that the average retail beef price for USDA All Fresh beef was $2.51. Suppose a survey of retailers is conducted this year to ...
Post your question