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The ages of U.S. aircraft have a mean of 13.0 years and a standard deviation of 7.9 years. If the Federal Aviation Administration randomly selects 35 commercial aircraft for special stress tests, find the probability that the mean age of this sample is greater than 15 years.
A simple random sample of 6 recent graduates revealed the following information about their weekly incomes. What is the expected value of the average weekly income of all the recent graduates?
Write the null and alternative hypotheses you would use to test the following situation.
Use the normal distribution to approximate the following probability: According to the most recent Davenport student profile, 47% of students have children under 17 living at home with them.
Any state auto insurance company took a random sample of 370 insurance claims paid out during a 1-year period. the average claim was $750 with a standard deviation of $150. find .99 confidence interval for the mean claim payment.
Suppose the following table shows the number of colds 7 different people got during the typical cold season based on the number of times they washed they washed their hands per day during the cold season.
Based on the equation of the least-squares line, we use software to predict the average number of home runs hit per game per team for the year 2001. We obtain the following.
The diameters of grapefruits in certain orchard are normally distributed with mean of 6.95 inches and a standard deviation of 0.75 inches. Show all work.
Find the area under the normal distribution curve between z = 1.52 and z = 2.43.
Is there evidence that the population mean is above $300, if X (bar) = $305.11 and s = $43.20?
Explain the difference between descriptive statistics and inferential statistics with less than 50 words? Name two graphs that can be used for describing qualitative data and two for describing quantitative data. Name one graph that can be used to ..
Use a .05 significance level to test claims that quarters manufactured with the new equipment have weights with a standard deviation less than .061
Determine the probability that the project will be completed in 90 days or less.
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