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A manufacturer of replacement parts estimates that 90% of the parts are useable. If the manufacturer sells the parts in packages of 10 parts, what are the mean and standard deviation of the number of useable parts in a package?
Perform a posthoc test that is suitable if we assume that group 7 is a control group and that the other are different treatment groups and that we are only interested in finding significant treatments, not to compare them.
What does a confidence interval tell us and why is it importance to use a confidence interval?
The amounts of money won by the top ten finishers in a famous car race are listed below. What was the mean prize earned? Round your answer to the nearest cents.
A random sample of 1440 current job applicants results in 61 failures (based loosely on data from the American Management Association).
A student team in a business statistics course performed a factorial experiment to investigate the time required for pain-relief tablets to dissolver in a glass of water.
Their monitoring plan will take a random sample of 5 days sales per month and use the sample mean sales to identify shops that are under-performing. Establish the lower limit sales such that only 5% of the shops would have a sample sales mean belo..
Let X 1 , X 2 , X 3 , X 4 be a random sample from a Poisson distribution with parameter λ and let Y = X 1 + X 2 + X 3 + X 4 . You decide to test λ = 1.60 versus λ
Smith Software Inc. is a computer software firm that has grown in size in recent years. To assist in its planning for future growth, you are to determine the trend of the number of accounts based upon the below.
A produce manager wants to estimate the mean size of coke bottle fills with 95 percent confidence. A preliminary sample of 12 bottles shows a sample standard deviation of 3 mil, and mean of 500.
A population of scores has m=50 and o=10. If 5 points are added to every score in the population, then the new mean and standard deviation would be:
How many of these new cardholders would you expect to default? What is the standard deviation?
Determine whether the following equations real or complex solutions; justify your answer. Note: It is not necessary to find the solutions; just determine if they are real or complex and explain why.
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