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6 questions in math statistics. Must show all work for each.
1.Political polls typically sample randomly from the U.S population to investigate the percentage of voters who favor some candidate or issue. The number of people polled is usually on the order of 1000. Suppose that one such poll asks voters how they feel about the President's handling of the crisis in the financial markets. The results show that 575 out of the 1280 people polled say they either "approve" or "strongly approve" of the President's handling of this matter. Based on the sample referenced above, find a 95% confidence interval estimate for the proportion of the entire voter population who "approve" or "strongly approve" of the President's handling of the crisis in the financial markets.Now, here's an interesting twist. If the same sample proportion was found in a sample twice as large-that is, 1150 out of 2560-how would this affect the confidence interval? 2.How is the rejection region defined and how is that related to the z-score and the p value? When do you reject or fail to reject the null hypothesis? Why do you think statisticians are asked to complete hypothesis testing? Can you think of examples in courts, in medicine, or in your area?3.What is the difference between the 'null hypothesis' and the 'alternate hypothesis'? 4.What are some tips for knowing 'how' to set up the two hypothesis? 5.Is the 'claim' always the alternate hypothesis? 6.When do we use a z-value rejection region when testing a claim about a population mean? When do we use a t-value?
A major dvd rental chain is considering opening a new store in an area that currently does not have any such stores. The chain will open if there is evidence that more than 5,000 of the 20,000 households in the area are equipped with dvd playe..
Find the expected value
Identify the part of setting up a simulation in Excel that you find to be the most challenging, and explain why. Identify resources that can help you with that.
What is Goldberg's rationale for the study? Was the study designed to contribute to theory? Do the results of the study contribute to theory? For both questions: If so, how? If not, why not?
The thickness of a printed circuit board is an important quality parameter. Data on board thickness (in inches) are given in Table 6E.4 for 25 samples of three boards each. (a) Set up and R control charts. Is the process in statistical control? (b) E..
Two percent (.02) of the items produced by a machine are defective. A random sample of 55 items is selected and checked for defects. Use the normal approximation to the binomial to find: The probability that the sample will contain 4 or more defects?
How do small companies compare to the major competitor and Has satisfaction with the manufacturer changed since the change in company ownership?
On any given flight, an airline's goal is to fill the plane as much as possible without overbooking. If, on average, 10% of customers cancel their tickets, all independently of each other, what is the probability that a particular flight will be o..
Perform a Hotelling T2 Two Sample test to determine if a certain drug has any effect in reducing flue-like symptoms. Use alpha = 0.01.
part i introduction this section should include some perspective about the problem you are trying to analyze in other
The authors of the assigned article, "A Patient-Driven Adaptive Prediction Technique to Improve Personalized Risk Estimation for Clinical Decision Support (http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3392846/) have found that using patient-driven, ad..
If the budget analyst wanted to build a regression model using only two independent variables to predict nursing salaries, what variables should be used?
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