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Assume that the heights of bookcases are normally distributed. A random sample of 16 bookcases in one company have a mean height of 67.5 inches and a standard deviation of 2.9 inches. Test the claim that the standard deviation of the heights of the bookcases is less than 3.0 inches. Use alpha=0.05.
Determine the z values for 29 and 34 hours. What percent of the garages take between 32 hours and 34 hours to erect? What percent of the garages take between 29 hours and 34 hours to erect?
The following table contains t0 new sub- oups of thickness data. Plot this data on the control charts from (a) based on the new subgroup size. Is the process in statistical control?
If hypothesis test for single population variance is to be conducted by using significance level of to 0.10, a sample size of n = 16, and test is a one-tailed upper-tail test, the critical value is?
The data represents the closing value of the Dow Jones Industrial Average (DJIA) over the 29-year period from 1979 to 2007.
At the .05 significance level, can we conclude that more than 60% of the homes have an attached garage? What is the p-value.
In Dallas some fire trucks were painted yellow (instead of red) to heighten their visibility. During a test period, the fleet of red fire trucks made 143, 348 runs and had 20 accidents, while the fleet of yellow firetrucks made 135,035 runs and had 4..
Assume the distribution of the length of the cuts follows a normal distribution with a standard deviation of 8 seconds. Suppose we select a sample of 16 cuts from various CDs sold by CRA CD's Inc. What can we say about the shape of the distributio..
Determine if there is reason to reject the claim made by Winston Tire Company and conclude that tires last for less than 40,000 miles.
Suppose a simple random sample of size 43 is selected from a population with = 11. Find the value of the standard error of the mean in each of the following cases.
"Broad constructionalists" believe that modern sensibilities need to be brought into any analysis of the document and what it means and that the spirit, rather than the letter, of the document should be used in determining national laws and regulatio..
an experiment consists of drawing one marble from a box that contains a mixture of red white and blue marbles.1.
At 0.01 significance level is it sensible to conclude that modification reduced number of traffic accidents?
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