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Assume the population standard deviation is a=25. (the a is actually the funny looking 0 with the line that goes from the top right up at an angle) Compute the standard error of the mean O(funny o with line) line over x, for sample sizes of 50, 100, 15o, and 200. What can you say about the size of the standard error of the mean as the sample size is increased?
Find the critical value, t0, to test the claim that the mean1>mean 2. Two samples are randomly selected and come from populations that are normal. The sample statistics are given below. Assume that standard deviation 2/1 is not equal standard devi..
Calculate the sample mean and sample standard deviation.
Prepare an ANOVA table and test the null hypothesis of no linear relationship between the two variables.
John, a medical practitioner at a private medical facility, is discussing the problem that one of his patients, Tom, says he has been having with the medication that the doctor has prescribed.
Find the power of the test designed to determine if the the new safety equipment is effective when the mean percent reduction is actually 2.3%. Assume that the population standard deviation is 12% and that α is 0.02. What is the power?
Determine the confidence interval for population mean and the Superintendent wants to determine the average amount of hours per week the student population studies at home.
For each of the 50 states and Washington, D.C., a number of statistics related to education are available for 1992
Now assume institutional cache is used. Hit rate for cache is 0.6. Determine the total average response time.
The registrar of a college with a population of N=4,000 full-time students is asked by the president to conduct a survey to measure satisfaction with the quality of life on campus.
As we can say there is 5.5 percent chance of seeing the current policy having an effect on smog in the results we observed from natural sampling variation.
If the probability that it will rain tomorrow is 0.33, then what is the probability that it will not rain tomorrow?
The mean and variance of the total amount of money that is collected from a car that crosses the bridge are:
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