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In a manufacturing process, we are interested in measuring the average length of a certain type of bolt. Past data indicates that the standard deviation is .25 inches. How many bolts should be sampled in order to make us 95% confident that the sample mean bolt length is within .02 inches of the true mean bolt length?
30 in Canada, and 6 in the United State. At level of significance 0.05, test whether the distribution of sales has changed from last year.
Construct a 95% confidence interval for the population mean, assuming a normal distribution?
A recent report from the American Medical Association claims that for the first time in ten years, the average salary of psychiatrists was greater than $190,000 with a standard deviation of $27,000. What is the null hypothesis for his claim?
What is an appropriate null hypothesis to compare the quality of the product manufactured in the overseas plants and the U.S. plants? Why?
Consider a binomial distribution with 15 identical trials, and a probability of success of 0.5. Find the probability that x = 2 using the binomial tables
Draw the complete decision tree and determine whether the product should be launched or not.
For every additional hour spent studying for the exam you would expect a grade improvement of 60.2 points
Assume rf is 5% and rm is 10%. According to the SML and CAPM, an asset with a beta of -2.0 has a required return of negative 5%[=5-2(10-5)]. Can this be possoble?
The time, in hours, that a copying machine may work without breaking down is the normally distributed random variable with mean 549 and the standard deviation 68.
A local politician in this town has stated that the average property taxes are $1800 and most people do not pay more than this amount. Conduct a test at the alpha = .01 level to determine if this is true. For this test, consider a sample size of 3..
A shoe salesman want to see if his female customers have a preference in the color of shoe purchased. What is the test value for the following data?
What the information do z-scores give that actual heights do no?
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