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Suppose that we wish to estimate the average daily pollution in Lake Erie. The daily yield, recorded for n = 50 days, produced a mean and standard deviation equal to y = 871 tons and s = 21 tons, respectively.
a. Estimate the 95% confidence interval for the average daily yield.
b. How many observations would be required to reduce the confidence interval by 10%?
an automobile manufacturer is concerned about a fault in the braking mechanism of a particular model. the fault can on
doug needs to construct a 98 confidence interval for the mean diameter of 3 inch schedule 40 drain pipe. he samples 25
Conduct a two-sample test of means. A study by a bank compared the average savings of customers who were depositors for three years or less with those who had been depositors for more than three years.
Using your simulation results calculate an estimate of the probability that the sum of the dice is 10 and the player is dealt three cards that can be put in sequence.
A random sample of eight cars from each manufacturer is selected, and eight drivers are selected to drive each automobile for a specified distance.
the following data represents the travel time in minutes to school for nine students enrolled in sullivans college
suppose the sample size from the normal population is 11. also assume that the population standard deviation is
Discuss the Population and size and the target population and brief reasoning - Calculate the sample size using a 95% confidence level, and a 5% margin of error.
Find the confidence interval for the population proportion.
One man can fix a machine in four hours and two men working together can fix a machine in three hours. The total maintenance cost (including downtime cost) in the case of two repairmen on duty is:
assume the life of a packaged magnetic disk exposed to corrosive gases has a weibull distribution with szlig 0.5 and
question what does a line plot do to the shape of the graph of time values which are not uniformly spaced? would an xy
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