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a. What is an estimate of the proportion defective for the piston manufacturing process when it is control?
b. Construct a p chart for the manufacturing process, assuming each sample has 200 pistons.
c. With the results of part (b), what conclusion should be drawn if a sample of 200 has 20 defective pistons?
d. Compute the upper and lower control limits for an np char.
e. Answer part (c) using the results of part (d).
Think of a case in which regression analysis was used, but not properly. For instance, discuss situations in which regression analysis is not appropriate and does not add useful information to our understanding of a set of data.
Suppose that a large corporation surveys all of their employees, and finds that 24% of them carry secondary health insurance. A representative from GoldStar Care visits 100 employees
Is there significant evidence that this production run doesn't meet specifications? Use a 1% level of significance.
Rosa's Italian restaurant wants to develop forecasts of daily demand for the next week. Develop a forecasting chart, using MS Excel. Include the steps used in your forecast.
First-order regression model was fit to data. Part of printout follows?
What are examples of variables that follow a binomial probability distribution? What are examples of variables that follow a Poisson distribution? When might you use a geometric probability?
Researcher is interested in testing whether there are differences in mean between population one and population two.
A car rental company has determined that the probability a car will need service work in any given month is 0.2. The company has 900 cars.
The upper limit of a 95% confidence interval for the population mean would equal:
The publisher reports that 80% of college professors require or recommend that their students purchase some type of textbook package.
A producer of pleasure boats wants to maximize revenue during the next month. Two types of boats are sold, x1 and x2. Type x1 sells for $40,000 and type x2 sells for $30,000. The x1 boats require 10 weeks of labor and 600 board feet of lumber each..
The standard screening test for Down's Syndrome is based on combination of maternal age and the level of serum alpha-fetoprotein. Using this test 80% of Down's syndrome cases can be identified, while 5 % of normals are detected as positive.
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