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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.
Experience raising New Jersey Red chickens revealed the mean weight of the chickens at five months is 4.35 pounds. The weights follow the normal distribution.
Additionally, method of delivery of drug (patch,pill, or nasal mist) was considered. In experiment, there were how many treatments?
What are the minimum and the maximum starting salaries of the middle 95% of the LU graduates?
Determine the following areas under standard Normal distribution curve.
part-11. mutually exclusive events are also independent. false2. if events a and b are independent then the probability
What does a squared correlation coefficient represent? Also, does the strength of the correlation depend on the direction? Finally, does correlation imply causation.
If two randoom samples of sizes n1 = 30 and n2 = 36 are selected independently from two populations with mean 78 and 85, and with standard deviations 12 and 15, respectively, then the standard error of the difference between Xbar1 and Xbar2 are eq..
As a bonus, students are encouraged to research new and interesting articles/ websites/ interactive tools, etc. which are pertinent to the class material.
A soft drink bottling machine is set to dispense soft drink into containers labeled 16 ounces. While the actual quantities vary they are normally distributed with a mean of 16.1 ounces and a standard deviation of 0.015 ounces.
Which of following statements would be right concerning a twotail test at 0.05 level of significance? We can conclude that average cottage cheese consumption in America is at least 0.705 pound more or less than 2.75 pounds per person per year.
They hope to use a sample size such that, with probability 0.95, the error will not exceed 0.04. What sample size will ensure this, regardless of what sample proportion value occurs when they gather the sample?
it was found that 110 were regular voters. Estimate the true proportion of regular voters with 90% confidence and comment on your results.
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