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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?
The Nerd Herd (TNH), a company that sends technicians to individuals' residences to fix problems with personal computers, has had considerable success in growing its business throughout the U.S. Upper Midwest region. Now TNH is looking for further ex..
Find the cumulative distribution function
What is the probability that at least 10 pay cash - Davids gasoline station offers 4 cents off per gallon if a customer pays cash and does not use a credit card.
A sample of 9 managers with over 15 years of experience has an average salary of $71,000 and a sample standard deviation of $18,000. Assuming that the salaries of managers with over 15 years experience are normally distributed, you can be 95% confide..
Use decision analysis tools discussed in class to determine what action the firm should pursue in order to minimize expected loss; either manual analysis or software is acceptable. Please also calculate the minimum expected loss.
Sears conducted a quality control study on the car batteries that customer purchase off of the shelf. 50 batteries are selected and it is determined that 6 are defective and 44 are functioning properly. This is a binomial experiment. Select the appro..
Given a standard normal distribution
quantitative analysis decision makingquestion 1- explain the advantages and disadvantages of two time-series analyses.
The lengths of Chinese giant salamanders can be modeled by a normal distribution with a mean of 113 cm and a standard deviation of 22 cm. 1. What percent of the Chinese giant salamanders do you expect to measure between 100 and 135 cm?
Find the test statistic and do the two-sample test for equality of proportions. Is the decision close?
A foreign language course and a psychology course?
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..
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