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Confidence interval for the population mean: Use of the standard normal
The union for a particular industry has determined that the standard deviation of the daily wages of its workers is $. A random sample of workers in this industry has a mean daily wage of $. Find a confidence interval for the true mean daily wage of all union workers in the industry.
Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place.
What is the lower and upper limit of the 90% CI?
In hypothesis testing, the level of significance is? When would you use a t test and when would you use an f test ? You are interested in the assumption that adult students earn better grades than traditional students.
A researcher believes that the percentage of people who exercise in California is greater than the national exercise rate. The national rate is 20%.
The following frequency table lists the sales of an item and the number of times it has occurred. It was obtained from historical records.
The sample mean, the sample proportion and the sample standard deviation are all unbiased estimators of the corresponding population parameters. True or false (please provide a solution or explanation).
Which of the following is the appropriate conclusion from carrying out these multiple comparisons
What can you conclude from chebychev's theorem about the percentage of adults in the town whose heights are between 59.7 and 72.9 inches? Show all work.
Verify that the fitted values have the same mean as the actual y-values, and that the residuals have mean zero and show that the variance of the fitted values plus the variance of the residuals adds up to the variance of y. Find the R-squared.
Calculate the population mean and compare it to the mean of the sampling distribution.
Suppose there are two samples of size 6 and 7, with a rank sum of 58 in the sample of size 6. Using the Wilcoxon rank sum test, evaluate the significance of the results, assuming there are no ties.
State the alternate hypothesis for this study? What critical value should be used to determine the rejection region? Use the 1 proportion Z-test.
What is the probability that exactly 9 of the children are cured? Report your answer to four decimal places, rounding in the usual way?
What is meant by a probability distribution? Discuss how you could use one of the text probability distribution at your workplace to help solve a business problem.
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