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Two independent samples of size 20 each are taken to test for a difference in the corresponding population means. The sample means differ by 5, and the pooled variance is 15. What is the value of the test statistic? Give your answer to four decimal places.
The manager of the Gander Mountain store in Frogtown, IL, believes that his prices for ammunition are lower than the prices of his primary competitor in the hunting equipment market, Cabela's.
what is the proportion of the total area under the normal curve within plus and minus two standard deviations of the
Insurance policy from company A costs $300 a year but guarantees to replace any losses due to theft. Create the decision tree.
The American Bar Association conducted a survey in 1986 showed that the average income of lawyers in 1986 was $ 120,000. An investigator took a sample of 64 lawyers in 1990, produced a median income of $ 140,000 with a standard deviation of $ 24.5..
Explain the difference between the null hypothesis and the alternate hypothesis. How is the null hypothesis chosen (why is it null)? What is the importance of rejecting the null hypothesis in relation of the sample to the population?
State the decision rule and sketch it. (c) Find the test statistic. (d) Make a decision. (e) Use Excel to find the p-value and interpret it.
Help with showing how do detrime the standard deviation of a problem when the standard deviation is 5. An example would help me to work out a problem for the normal probability distribution.
Assume the population standard deviation is 7.1 mpg. State the correct null and alternative hypotheses that the company wishes to test. Calculate the test statistic that would be used for conducting the desired test.
A sample standard deviation = 5.60 hours, find the upper limit of a 98% confidence interval estimate of the true population mean life.
A delivery truck averages 15 miles per gallon, with a standard deviation of 3 miles per gallon, and that fuel consumption is Normally Distributed.
A local group claims that the police issue more than 60 speeding tickets a day in their area.
In selecting a sample from a population for the purpose of making and inference from the sample about the population, it is important
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