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The addition of a new accelerator is claimed to decrease the drying time of latex paint by more than 4%. Several test samples were conducted with the following percentage decrease in drying time. Assume that the percentage decrease in drying time is normally distributed.
5.4 6.6 3.7 6.0 3.1 2.0 2.7 4.2
(a) Find the 95% confidence interval for the true mean decrease in the drying time based on this sample. (Give your answers correct to two decimal places.)
A mean of 68 years and a standard deviation of 3.5 years. Find the age at which payments have ceased for approximately 86% of the plan participants.
Describe why ordinary least squares solution is not unique. What can you say about residuals of any solution? Is ridge regression solution unique? Explain why or why not?
The average hourly wage of employees of a certain company is $9.83. Assume the variable is normally distributed.
Estimate the percent that did not have any dental expense. What was the cost for the 10 percent of employees who incurred the highest dental expense?
an electronic product contains 25 integrated circuits. the probability that any integrated circuit is defective is 0.01
Develop a scatter diagram for the data and write a brief summary.
questionpart a you have been offered the choice of 3 prizesprize 1 15000 cash payable immediatelyprize 2 2 yearly
The chamber of commerce of a Florida Gulf Coast community advertises that area residential property is available at a mean cost of $125,000 or less per lot.
a machine is designed to fill jars with 16 oz. of coffee. a consumer suspects that the machine is not filing the jars
Use Chebyshev's theorem to find what percent of the values will fall between 201 and 345 for a data set with a mean of 273 and standard deviation of 18.
Steps in hypothesis test procedure - conducting a hypothesis test for some general statistic, ? say.
What would be your best point estimate for average Sales in weeks for which Newspaper advertising were $1 million? What would be an appropriate interval estimate for this?
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