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A gallon of milk should have 128 ounces. A dairy fills milk containers using a process that is normally distributed with a mean of 128 ounces and a standard deviation of 2 ounces. A random sample of 30 containers is taken. What is the probability of a sample average less than 127 ounces?(Round your answer to 3 decimal places; for example; 0.123)
a data set consists of 83 test scores. over a long period it has been found that the mean and standard deviation for
At the .01 significance level, is there a difference in the use of the four entrances?
Several hundred students enrolled in introductory statistics courses at a large university were surveyed on various days of the week and asked to report
Suppose that, when we survey 20 randomly selected dish owners, we fi nd that 4 of the dish owners actually subscribe to at least one premium movie channel. Using a probability you found in this exercise as the basis for your answer, do you believe..
In the BS Lottery (which stands for "Business Statistics", of course), players choose 5 numbers out of 30. They win if they choose the same 5 numbers.
Suppose that the ordering cost is not $20, and Mouse Parts is ordering 150 units each time an order is placed. For this ordering policy to be optimal, what would the ordering cost have to be?
A sample of 3000 observations has a mean of 85 and a standard deviation of 10. The distribution is bell-shaped. Using the empirical rule, find what percentage of the observations fall in the intervals
The second attributed to wearout, has a Weibull distribution with a characteristics life of 10 year and a shape parameter of 1.8. Determine the system reliability for a design life of 1 year. Find by trial and error the median time of failure.
Andy Lange is concerned with declining business at the bookstore. The students tell him that the prices are too high. Andy, however, has decided not to lower the prices. If the same conditions exist, what long-run market shares can Andy expect ..
Give a 95% confidence interval for the difference between the mean weight of male mice and female mice using a statistical program.
The cluster is less effective for a given sample size than unrestricted random and stratified samples as items are not individually selected.
Pareto charts. Continue the study of the process of getting to work or class on time from Exercise 27.2. If you kept good records, you could make a Pareto chart of the reasons (special causes) for late arrivals at work or class. Make a Pareto char..
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