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A researcher is interested in finding out whether the variance of the annual repair costs also increases with the age of the automobile. A sample of 26 automobiles 4 years old showed a sample standard deviation for annual repair costs of $170 and a sample of 25 automobiles 2 years old showed a sample standard deviation for annual repair cost of $100.
a. State the null and alternative versions of the research hypothesis that the variance in annual repair costs is larger for the older automobiles.
b. At a .01 level of signifigance, what is your conclusion? What is the p-value? Discuss the reasonableness of your findings.
The probability is 1 in 4,000,000 that a single auto trip in the United States will result in a fatality. Over a lifetime, an average U.S. driver takes 50,000 trips. (a) What is the probability of a fatal accident over a lifetime? Describe your re..
A complete census taken at the university a few years prior indicated a mean age of 22.4 years with a standard deviation of 7.6 years. Test the null hypothesis at the .05 level.
Five digit random numbers (e.g.; 601, 022, 448...), determine the first four elements that will be selected for the simple random sample.
agents at an insurance company office in a small town process an average of fifteen auto insurance claims per week.
a little confused on this one.assume the probability of a household owning a blue-ray player is 0.70.what is the
question suppose that a is the set of sophomores at your school and b is the set of students in discrete mathematics at
Is there a relationship between sales and newspaper?
Please use the regression procedure within Excel under Tools > Data Analysis to construct this equation.
For the constant sound group: 1, 10, 1, 10, 1, 9, 7, 3. And for the no sound group: 4, 3, 6, 4, 5, 8, 4, 9. A. Assume that the standard deviations are equal and find the test statistic for the test that the between mu1 and mu2 is zero.
Find the sample mean and sample standard deviation for the amount of unspent money returned at the end of the day.
Determine the minimum sample size to construct a 90% confidence interval for the population mean. Assume the population standard deviation is 1.2 years.
Make a point estimate of the population mean difference in endurance after taking the herbs. Make a 95% confidence interval estimate of the population mean difference.
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