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When the robot welder is functioning properly, the natural gas cylinders being produced have an average burst strength of 3400 psi, with a standard deviation of 100 psi. Determine the centerline and the upper and lower control limits for a 3-sigma mean control chart in which each sample consists of 4 cylinders
How many cans of paint should the sample contain if the researcher wants to be 98% certain of being within one percentage point of the true proportion of this chemical?
From her district, consisting of several hundred stores, she selects a random sample of 30 stores. For each store she gathered the following information.
Determine percent of the garages take between 29 hours and 34 hours to erect? Determine percent of garages take 28.7 hours or less to erect?
Find the standard normal area for each of the following: (Round the answers to 4 decimal places.)
An independent testing services road-tested 36 of the automobiles.
We would like to test if the proportion of respondents that support the health care bill is less than 50% (a) what kind of hypothesis test is appropriate?
At the 0.10 significance level, can we conclude that the annual rates of return are higher on the big board?
Compare a tabular cum sum chart using standardized values h = 5 and k = 1/2. What is the information you learn.
How close is the calculated value to your experimental value?
What is Peter's median grade point at graduation? What is the shape of the grade point distribution?
If writing scores for population have standard deviation of s = 20, does sample give sufficient evidence to conclude that new composition course has significant effect? Suppose a two tailed test with a = 0.05.
What can you conclude from Chebyshev's theorem about the percentage of adults in the town whose heights are between 57.3 and 77.7 inches? Please show work.
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