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Joes Trucking provides shipping service from the outlying areas of New York City to a known distribution point within Manhattan. To understand the number of trucks required for a given service level agreement defined by a guaranteed delivery interval, the operations manager conducts a study of drive times. The manager would like to obtain an accuracy of 10 min, plus or minus 5 minutes. Randomly sampling the drive times over a 30-day period, including weekends and all times of day, produces 300 data points. A 95 percent confidence interval is required to ensure customer satisfaction. The mean is found to be 3.01 hours, with a standard deviation of 0.64. Is the sample size adequate for the accuracy requirements? If yes, determine the confidence interval for the mean delivery time.
The population standard deviation can be assumed known as .24. What is the 95% confidence interval estimate of the mean undergraduate GPA for students admitted to the top graduate business schools.
The company wants to formulate a linear programming model to determine the number of grams of each ingredient that must go into the drug in order to meet the antibiotic requirements at the minimum cost.
Determine the test statistic. At 95% confidence, test to determine if more than 21% of the population will like the new soft drink.
Suppose you estimate a regression model to predict weekly expenditures on food per person. Would you be pleased if your model estimate a Standard Error =$300 EXPLAIN?
Let T have the exponential distribution with parameter lambda, and let Y=Sqroot(T).
If 20 measurements are taken and their standard deviation is 1.8, is there enough evidence to reject the claim that her standard deviation is within the limit at ∞ = .01?
Create a research question for one of the following groups: students, children or women. Include the independent and dependent variables you would study, an explanation of whether a one or two-tail test is most appropriate
A member of Congress wants to determine her popularity in a certain part of the state. She indicates that the proportion of voters who will vote for her must be estimated within plus or minus 2 percent of the population proportion.
Three different methods for assembling a product were proposed by an industrial engineer. To investigate the number of units assembled correctly with each method
Find the mean, median, mode, sample variance, and range. Do you think that this sample might have come from a normal population? Why or why not?
Reggie Miller of the Indiana Pacers is the National Basketball Association's best career free throw shooter, making 89% of his shots. Assume that late in a basketball game, Reggie Miller is fouled and is awarded two shots.
Your statistics instructor wants you to determine a confidence interval estimate for the mean test score for the next exam.
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