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The Human Relations Director at DuPont began a study of the overtime hours in the Inspection Department. A sample of 16 workers showed they worked the following number of overtime hours last month:
12 10 15 8 7 4 5 9
8 12 11 9 6 2 12 3
a) Compute the arithmetic mean and discuss what the answer in the context of the problem.
b) Compute the standard deviation and discuss what the answers means in the context of the problem
c) Are the values calculated in part (a) and (b) statistics or parameters? Explain why.
Calculate the control limits for a c chart when Ubar = 3.0%, n = 60, and you collect one sample per hour for 40 hours of production. (2 sets of control limits required, x bar and range)
Test the financial analyst's belief that the average rate charged by credit cards with monthly fees is less than 14%. Use a 5% significance level.
The following data are based on information from Domestic affairs. Let X be the average number of employees in a group helh insurance plan, and let Y be the average administrative cost as a percentage of claims.
What are the probabilities of accepting lots that are 10 percent, 20 percent, and 30 percent defective? Estimate the probability of accepting a lot that is 15 percent defective.
What is the 95% confidence interval for the standard deviation of birth weights at County General Hospital, if the standard deviation of the last 25 babies born there was 1.1 pounds.
Find the distribution of profit for a unit price of $500. Use the Decision Table tool to find the best price between $400 and $600 in steps of $25.
A physiologist wishes to study the effect of birth control pills on exercise capacity. Five female subjects who have never taken the pill have their maximal oxygen uptake measured during a treadmill session.
What percentage of the averages or medians of the sample will be greater than 140 seconds?
The International Agricultural Producers publishes annual data on various selected farm products. Shown above are the unit productions figures.
A researcher claims the average American drinks 52 gallons of cola per year with a population standard deviation of 2.0 gallons. We sample 25 random people and find the mean yearly consumption was 49 gallons.
If the 95% confidence interval for the average age of a learner at Capella is 27.8 yrs.
The Ministry of Environment, Science and Technology has one of its administrative centers located out of town and the majority of employees drive to work. As part of the Ministry’s ‘green’ policy
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