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An auditor claims that the average annual salary of a project manager at a construction company exceeds $82,000. A random sample of 20 project managers had an average salary of $89,600 with a sample standard deviation of $12,700. Assume the salaries of the managers are normally distributed. You want to test the claim at the alpha = 0.01 significance level. If using the "critical value approach" for your hypothesis test, what will be your critical value(s)?
a. approximately 2.539b. approximately 2.680c. approximately 2.33d. none of the above
An appliance manufacturer is considering the purchase of a new machine for stamping out sheet metal parts. If μ0 (given) is the true average of the number of good parts stamped out per hour by their old machine and μ is the corresponding true unkn..
Refer to the previous exercise. Draw a tree diagram to illustrate the probabilities in a situation where you ?rst identify the type of institution attended and then identify the gender of the student.
Develop a point estimate of the number of minutes per day officeworkers waste trying to locate mislabeled, misfiled, or misplaced items.
for a certain type of electronic component the lifetime x in thousands of hours has an exponential distribution with
Give a 99% con?dence interval for the proportion of people in the given age group who may be successfully treated with the facial cream.
1 consider a resource-allocation problem having the following
Calculate the probability that the median of the sample or average medians is:
Customers arrive at a two-server system according to a Poisson process having rate λ = 5. An arrival ?nding server 1 free will begin service with that server.
Does your analysis change if the term "average" refers to the mean? To the median? Explain what effect this misinformation might have on the perception of the nation's schools.
an inspector correctly identifies defective products 90 of the time. for the next 10 products the probability that he
For a randomly selected woman, find the probability that her sitting eye height is less than 700 mm. The probability that a woman's sitting eye height is less than 700mm is .1190.
Divide the class into three teams. Each team will access various search engines for information on Terry Childs, who was the network administrator for the City of San Francisco, California. One team will act as the prosecution and will present the..
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