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A QC technician measures the quality for two lots of product. In the first lot, 25 units are tested and the average measurement is 75 with a standard deviation of 15. In the second lot, 32 units are tested with an average mea surement of 69 and a standard deviation of 12. Given that higher is better for this quality measurement, test the hypothesis that the quality of the second lot is lower than that of the first lot using a = 0.05. You may assume the two lots come from populations with the same variance.
Patients who were discharged during the year 2009. Using the information obtained from the sample to predict population characteristics with respect to malpractice litigation is an example of?
If the goal is to test whether less than 75% of the flights depart on time, what is the value of the critical test statistic at the 10% level of significance?
Determine the probability of choosing the area code at random which ends in the odd number if first digit cannot be 1 or 0?
why is it important that a sample be random? for its validity all hypothesis testing depends heavily on the assumption
Do you think the Poisson distribution, which assumes independent arrivals, is a good estimation of arrival rates in the following queuing systems? Defend your position in each case.
A hospital human resources manager finds that the local average starting salary for nurses is $24,000. She randomly samples 10 nurse's salaries at the hospital and calculates a mean of $23,450 and a standard deviation of $400.
How would you approach identifying the two correct time series in #1 to the proceed to merge them into one and make a weekly estimate of attendance?
In the past, only 5% of these diskettes have had bad sectors. If the company wishes to set 99.7% control limits based on samples of size 500, what would these limits be?
What is the distribution of sample means.
1 a particle on the x-axis is moving to the right at 2 units per second. at a certain instant it is at the point 50.
sixteen determinations of the ratio of iodine to silver in four different silver preparations were made with the
calculate the standard deviation of the data. for this calculation compute the difference between each one of the
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