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The average number of weeks that banner ads run at a Web site is estimated to be 5.5. You want to check the accuracy of this estimate.
A sample of 50 ads reveals a sample average of 5.1 weeks with a sample standard deviation of 2.3 weeks. State the null and alternative hypotheses and carry out the test at the 5% level of significance.
Suppose that a population is normally distributed with a mean of 100 and a standard deviation of 15. Would it be unusual for the mean of a sample of 3 to be 115 or more?
Determine Probability using exponential distribution.The average time between failures of a laser machine is exponentially distributed with the mean of 40,000 hours.
Use the population standard deviation along with the sample mean, S, and find a 92% confidence interval for the population mean. Is the true population mean contained in this interval?
This company buys in equal volume from both suppliers, with half of the orders going to each supplier. What is the probability that a component to be installed is defective?
a company is studying the number of monthly absences among its 125 employees. the following probability distribution
Given the current economy, where employees are asked to do more with less, job stress is at an all time high. An organization wished to determine what factors in the work environment were causing the most job stress.
1.two coins are tossed and the total number of heads is counted. which of the following would be a legitimate
a certain segment of the sky contains z stars. each star is either a red giant with probability 13 or a white dwarf
Suppose you manage Tennessee Grilled Pork, a fast food restaurant specializing in pork sandwiches and pork chops on a stick. You have decided to build a new restaurant and have 2 possible site locations
What ethical issues are raised in the following: (a) Prisoners volunteer in anticipation of more favourable treatment.
Is there reason to believe there is a positive linear correlation between the number of t.v. commercials and the sale of this product?
When using a general LP model for transportation problems, if there are 4 sources and 3 destinations, which of the following statements is true?
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