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Question: Find a 95% confidence interval for the proportion of all bills paid within 15 days. Find a 95% confidence interval for the difference between the proportion of large customers who pay within 15 days and the similar proportion of medium-size customers. Find a 95% confidence interval for the difference between the proportion of medium-size customers who pay within 15 days and the similar proportion of small customers.
Selecting a sample of 50 one bedroom apartments in this town and getting a sample mean of less then $530 if the population standard deviation is $100?
Lets say a business has account receivables per customer of $60.54. There was a random sampling of 19 accounts that revealed a sample mean of $73.55 and a sample standard deviation of $19.29.
Construct an appropriate control chart and comment on the process assuming a type I error rate of 0.005. What would the control limits be for a type I error rate of 0.05? What factors would influence your selection of the type I error rate?
Use the following equation for questions 1 and 2. (y + 5)2 = -12(x - 7) 1. Given the above equation of a parabola find the coordinates of the Vertex.
If the statistical program produces a regression that includes only the first two independent variables, what can we conclude about the third variable, weight of mother?
What are the variables in this study? For each, indicate whether it is quantitative or categorical and what the units are.- Here are histograms of calcium concentration and mortality. Describe the distributions of the two variables.
What is the probability that Y is less than 1? Sketch the density curve, shade the area that represents the probability, then find that area. Do this for (c) also.
Each month, the Sports Exports Company (a U.S. firm) receives an order for footballs from a British sporting goods distributor. The monthly payment for the footballs is denominated in British pounds, as requested by the British distributor. Jim Lo..
Find the mean and standard deviation of the difference in price of a ticket to China and a ticket to France.- Do you need to make any assumptions in calculating these means? How about the standard deviations?
The National Highway Association is studying the relationship between the number of bidders on a highway project and the winning (lowest) bid for the project.
Compute the correlation coefficient between the total prize and the difference between Jill's prize and Bill's prize in terms of µ and σ2.
both of which imply that MBAs have an advantage in being promoted. - Can you derive the probabilities in Equation (4.15)? Can you shed any light on this "paradox"?
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