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Hurricane Katrina s hurricane force winds extended 120 miles from its center. Katrina was a big storm, and that affects how we think about the prediction errors.
Suppose we add 120 miles to each error to get an idea of how far from the predicted track we might still find damaging winds. Explain what would happen to the correlation between Prediction Error and Year, and why.
10 parts produced by this machine are randomly selected, what is the probability that more than 2 turn out to be defective? Round your answer to four decimal places.
Dr. Stallter has been teaching basic statistics for many years. She knows that 80 percent of the students will complete the assigned problems.
Describe the measures of central tendency. Under what condition(s) should each one be used
Thirty teeth were randomly allocated into three groups of 10 and a cavity in each tooth filled using one of three preparations. Perform Kruskal-Wallis tests for the PLP measurements. What is your conclusion
Redesign each study to eliminate any confounds that you find. Write a short paragraph for each case below, identifying the confound and indicating how you would eliminate it.
Determine the probability that all five lose money.- The probability that all five make money.- The probability that at least two lose money.
The study reported in "Gait Patterns During Free Choice Ladder Ascents" (Human Movement Sci., 1983: 187-195) was motivated by publicity concerning the increased accident rate for individuals climbing ladders.
There is a famous saying in statistics that "Correlation does not imply causation". Please address the following questions:
Based on this confidence interval, can we be 95% confident that the mean yield using catalyst XA-100 exceeds 750 pounds per hour? Why?
If the three balls are selected without replacement, what is the probability distribution of Y? What are the mean and standard deviation of Y?
A die is rolled twice. Let X denote the sum of the two numbers that turn up, and Y the difference of the numbers (specifically, the number on the first roll minus the number on the second). Show that E(XY ) = E(X)E(Y ). Are X and Y independent?
Jones Nissan in Sumter, South Carolina, sold 10 Nissans yesterday. What is the probability that exactly 1 vehicles require warranty service?
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