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A population is normal with a variance of 17. Suppose you wish to estimate the population mean, u. Find the sample size needed to assure with 68.26% confidence that the sample mean will not differ from the population mean by more than 3 units.
question a box contains 18 computer disks 5 of which are known to have bad sectors. in how many ways can 4 disks be
Is it true that one of the important properties of time series models is that some sort of pattern in the data over time should be detected first and then used within the model?
Develop regression models to predict the selling price based upon each of the other factors individually. Which of these is best?
Can we conclude at the 5% significance level that the population mean weight of athletic men is lower than the population mean weight of non-athletic men?
The evidence supports the manufactuer claim at the .05 significance level. Suppose 49 bulbs were tested with the folowing results: x-bar = 827.5 hours, s= 70 hours. Conduct the test using alpha=.05.
Calculate, test, and interpret the relationship between two variables using the correlation coefficient.
suppose that 67 of the employees of a company participate in the companys medical savings program. let x be the number
in a gallup poll of 1003 randomly selected subjects 373 said that they have a gun in their home. the accompanying
Estimate with 95% confidence the mean reduction in time it takes for someone who has taken the sleeping pill to fall asleep.
If 20 measurements are taken and their standard deviation is 1.8, is there enough evidence to reject the claim that her standard deviation is within the limit at ∞ = .01?
lie detectors are controversial instruments barred from use as evidence in many courts. nonetheless many employers use
Construct four questions, each question reflecting one of the four corresponding levels of measurement, that a mortgagor (borrower) would answer relevant to their home mortgage.
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