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A simple random sample of 40 salaries of NCAA football coaches has a mean of $415,953 and a standard deviation of $463,364.
a. Find the best point estimate of the mean salary of all NCAA football coaches.
b. Construct a 95% confidence interval estimate of the mean salary of an NCAA football coach.
c. Does the confidence interval contain the actual population mean of $474,477?
Determination of statistical significance can only be determined by calculating the exact p value and declaring results as significant. True or false?
Develop a regression model to predict Costsbased on the Level of Productionand compare it to the dispersion obtained from the table above.
Mean SAT score is computed for each sample. If the sample size is n=2,500, find the mean and standard deviation of the distribution of sample means.
Calculate the average student score necessary for the district to retain its federal funding. You may assume that the Standard Deviation will not change. This will require some thought. Think of the z score. You will be solving for mu (average test s..
The required margin of error around the population p. Margin of error: 0.09; confidence level: 95%; from a prior study, p is estimated by the decimal equivalent of 87%.
A sample of n=9 scores is obtained from a normal population distribution with o-=12. The sample mean is M=60.
the time it takes a cell to divide called mitosis is normally distributed with an average time of one hour and a
in the following problem check that it is appropriate to use the normal approximation to the binomial. then use the
This sample group has errors with a standard deviation of 54.7ft. At the 5% level of significance, test that the new population has errors with a standard deviation equal to 43.7ft.
Find a 95% confidence interval for the mean µ of the population from which the men were selected.
The 30 members of an orchestra were asked how many instruments each could play. The results are set out in the frequency distribution. Calculate the mean number of instruments played:
If the test contains 250 questions, what is the probability that Julie will score 75% or lower? (Use the normal approximation to the sampling distribution to solve this problem.)
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