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John Kim is the purchasing manager for your computer, Inc., a manufacture of network servers. A truckload of sheet metal has just arrived. Previous experience with the supplier suggests that the thickness of the sheet metal follows a normal distribution. A random sample of 23 sheets yields an average thickness of 0.192 inches with a standard deviation of 0.0187 inches.
a) Determine the degrees of freedom to be used in further analysis.
b) What is the point estimate that John uses for the thickness of a sheet?
c) Calculate a 95% confidence interval for the population mean for sheet metal thickness.
d) Calculate a 90% confidence interval for the population mean for sheet metal thickness.
e) This shipment will be used to fill an order for NASA to be used in the Space Station project. Their inspectors will be very concerned if the thickness of the sheets does not meet the specifications of 0.20 inches because of the weight calculations that need to be made for the project. Should John accept the shipment? Explain your reasoning clearly.
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In addition, record the values for the UCL, center line, and LCL. Also, record any points that are out of control. Use a z-value of three.
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Which of the following best expresses the value of using percentages in data presentation? A. Provides for the calculation of marginals.
Key Refining decided to send a special financing plan to charge account customers having the highest 10 percent of the money charges. What is the dividing point between customers who receive the special plan and those who do not.
Jasmine is an African American graduate student. She is conducting research on the effects that affirmative action programs have had on American corporations.
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