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A civil service exam yields scores which are normally distributed with a mean of 81 and a standard deviation of 5.5. If the civil service wishes to set a cut-off score on the exam so that 15% of the test takers fail the exam, what should the cut-off score be?
What is the probability that the person will be the last to leave the bank assuming no other customers arrive? Explain your answer fully.
Discussion 1: Many people do not "like" or "trust" single point estimates for things they need measured. How might adding confidence intervals help managers accept the results better? Why?
Assume the likelihood that any flight on Northwest Airlines arrives within 15 minutes of the scheduled time is .90. We select four flights from yesterday for study.
A multiple choice quiz has 150 questions each with 5 choices and only 1 is the correct answer. What is the probability that sheer guess work yield from 30 to 40 correct answers out of the 150 questions?
Professor Brunner had students in his Marketing class rate his performance as Excellent, Good, Fair, or Poor. A graduate student collected the ratings and assured the students that Professor Brunner would not receive them until after the course gr..
List at least 3 qualitative attributes of the snack food about which they might want to ask consumers. Make sure at least one of them is nominal.
Give the expected value and standard deviation of defective shoes in the ShoeFit store order.
Do you think it would be justified for people of certain racial or ethnic groups to be subject to additional security checks at airport check points?
Formulate and solve a linear programming model for Julia that will help you advise her on which offer to accept from the director if any. Julia's younger brother who is a freshman at Tech wants to help Julia increase her profits by loaning her so..
The useful life of an electrical component is exponentially distributed with a mean of 2500 hours. a. What is the probability the circuit will last more than 3,000 hours.
A behavioral research situation that could use a Pearson coefficient research study and a chi square research study. Present the rationale for each selection.
Help with showing how do detrime the standard deviation of a problem when the standard deviation is 5. An example would help me to work out a problem for the normal probability distribution.
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