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Assume that the salaries of elementary school teachers in the United States are normally distributed with a mean of $31,000 and a standard deviation of $3,000. If a teacher is selected at random, find the probability that he or she makes less than $25,000.
given the following hypothesish0 u 400h1 u ? 400a random sample of 12 observations is selected from a normal
The GMAT scores from a sample of 50 applicants to an MBA program indicate that none of the applicants scored below 450. A frequency distribution was formed by choosing class intervals 450 to 499, 500 to 549, and so on, with the last class having a..
Community policing strategies have been useful in some jurisdictions to reduce crime. As Police Captain, you wish to run an experiment to see whether it will work in your city.
Suppose that the two lists are combined to produce a new list of 18 values. What is the average (mean) of this new list?
At the .01 significance level, can we conclude that there is more variation?
If the payoff from outcome A is twice the payoff from outcome B, then the ratio of these utilities will be.
An accounts receivable auditor is examining accounts for a client. The accounts receivable balance can be considered as a continuous random variable that exhibits normal distribution characteristics.
The Kruskal-Wallis rank test is a nonparametric replacement - The Wilcoxon rank sum test tests a null hypothesis
Find the relative risk for moderate beer drinkers as compared to nondrinkers, finds the 95% confidence interval
The chance of winning a prize for each of the 15 plays is 50-50 if you bought 15 tickets, what is the chance of winning 10 or more prizes?
What is the probability that sheer guesswork yields betwenn 25 to 30 correct answers for the test (assume the student has no knowledge of the problems). Be sure to justify why you can use the method you do.
A shipment of crankshafts is believed to be defective. A simple random sample of 16 is drawn from a large shipment. Check to see if the sample is any different from the assumed population mean of 224.
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