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The amount of time a bank teller spends with each customer has a mean of 3.10 minutes and standard deviation of 0.45 minutes. A random sample of 36 customers is selected. What is the probability that the average time spent per customer is between 2.9 and 3.2 minutes?
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. A market analyst is hired to provide information on the type of customers who shop at a particular store. A random survey is taken of 100 shoppers at this store. Of these 100, 73 are women. The shoppers are grouped in three age categories, under 30, 30 up to 50 and 50 and over. The data is...
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if the mean is 65.7 inches what is the z score of 55 inches
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Moerdyk & Co. is considering Projects S and L, whose cash flows are shown below. These projects are mutually exclusive, equally risky, and not repeatable. If the decision is made by choosing the project with the higher IRR, how much value will be forgone? Note that under certain...
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Is a specific approach better than the other one? Test at .2 significance level Approach A: lived on average and additional = 7.8 years; standard deviation = 1.6 years; n = 16 patients Approach B: lived on average and additional = 6.4 years; standard deviation = 2.4 years;...
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5. A farmer in Georgia must decide which crop to plant next year on his land: corn, peanuts, or soybeans. The return from each crop will be determined by whether a new trade bill with Russia passes the Senate. The profit the farmer will realize from each crop given the two possible results on the...
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14.17 (a) Choose one beverage category and plot the data. (b) Describe the trend (if any) and discuss possible causes. (c) Would a fitted trend be helpful? Explain. (d) Fit several trend models. Which is best, and why? If none is satisfactory, explain. (e) Make a forecast for 2005, using a...
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Regression Paper Use the numerical data from one of the data sets available through the Data Sets link on your student website. Develop one research question and formulate a hypothesis which may be tested with linear, bivariate regression analysis. Prepare a 500- to 750-word...
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when 306 students are randomly selected and surveyed it is found that 115 own a car. Find a 99% confidence interval for the true proportion of all college students who own a car
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