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Individual scores of a placement examination are normally distributed with a mean of 84.2 and a standard deviation of 12.8.
If the score of an individual is randomly selected, find the probability that the score will be less than 90.0.
If a random sample of size n = 20 is selected, find the probability that the sample mean will be less than 90.0.
When 6 telephones are received, all of them are free of defects. What is the written description of the complement of the above event?
Based on the scatter diagram, does there appear to be any relationship between the number of assemblers and production? Explain.
Consider the following hypothesis test What is the value of the test statistic? What is the p-value? With a=.05, what is your conclusion, reject or accept?
Use a one-tailed hypothesis test with an alpha level of .01 to demonstrate. Calculate the estimated r squared, the percentage of variance accounted for, to measure the size of this effect.
Label and describeeach step of the hypothesis testing procedure, and be sure to specify whether this is a one-tailed or two-tailed test.
Describe the sampling distribution of the sample mean.
What is the numerical value of the sample proportion p^ ? The P-value is the probability of what event?
A United Nations report shows the mean family income for Mexican migrants to the United States is $27,000 per year. A FLOC(Farm Labor Organizating Committee) evaluation of 25 Mexican family units reveals a mean to be $30,000 with a sample standard..
Ffind the mean, variance and standard deviation of binomial distribution? what valuses of the random variable X would you consider unusual?
At the .025 significance level, can we conclude that less than 88 percent of the orders are delivered in less than 10 minutes?
Suppose we have randomly and independently sampled 25 women and asked each whether she has been a victim of domestic abuse at some point in her life. Find the probability that more than 22 of the women sampled have not been the victim of domestic ..
In the past few years out sourcing over seas has become more frequently used than before by U.S. companies. However, out souring is not with out problems. A recent survey indicates that 20% of the companies that outsource over seas use consultant.
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