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The recent default rate on all student loans is 6.8 percent. In a recent random sample of 293 loans at private universities, there were 11 defaults.
Using the 0.01 level of significance, is there evidence that the population mean is above 32 minutes? What is your answer in (a) if X (bar) = 37 minutes and s = 27 minutes?
A manufacturer of tires wants to advertise a mileage interval that excludes no more than 10% of the mileage on tires he sells. All he knows is that, for a large number of tires tested, the mean mile
Using all possible predictors select a model using forward regression. Using all possible predictors select a model using backward elimination.
Consider two values, r = 0.08 and r = ?0.58. Describe them in relationship to each other. Describe the clinical importance of both r values.
Is there any difference between the proportion of americans who wish they were rich and the proportion of canadians who wish they were rich? A random sample of 1,000 americans showed that 550 wish t
The Lakeside Boatworks is planning to manafacture three types of molded fiber glass recreational boats-a fishing (bass) boat, a ski boat, and a small speedboat. The estimated selling price and varia
Using the data below construct a table that combines robbery and assault into one category, labeled "violent, and theft and burglary into another category, labeled "property" and create a frequency
Approximate using Poisson distribution the number of states that Peter is going to get wrong. What is the probability that he gets all states right?
Candidates Smith and Johnson are running for US President. Peter the Pundit estimates the probability that Johnson wins in each of the 51 states (let us call Washington, DC also a state).
A testing organization reported that 5% of their scores are under 450 while 40% of their scores exceed 1085. Assume that test scores are normally distributed, what is the average and standard deviat
What are the null and alternative hypotheses? What is the test statistic? What is the P=Value? What is the conclusion about the null hypothesis?
Substrate concentration (in mg/cm3) of influent to a reactor is normally distributed with mean 0.3 and standard deviation 0.06. What is the probability that the concentration is between 0.22 and 0.32?
Components of a certain type are shipped to a supplier in batches of ten. Suppose that 70% of all such batches contain no defective component, 20% contain one defective component, and 10% contain tw
Construct a line chart for the number of prior DUI (driving under the influence) arrests received by a sample of jail inmates currently incarcerated for drunk driving.
The total number of cars and light-duty trucks sold in 2013 was 2.234 million while 1.346 million were sold in 2009. Compute the market share for each of the companies.
What is the approach to determining the difference between two samples, once you have determined that all of the samples are not the same?
How well do exams given during the semester predict perfomance on the final? One class had 3 tests during the semester. Computer output of the regression gives:
Professor Alpha and Beta both teach statistics. The following table shows the distribution of their final grades. We wonder whether one of these professors is an "easier'" grader
A random sample of students was weighed after their first week of their first semester and weighed again after their final week of their first semester. Is there strong evidence that the students ga
Based on your sample result, calculate a 95% Confidence Interval for the true population value. Calculate a 95% Confidence Interval for the proportion of heads.
A researcher conducts a study of white and black attitudes toward the police in her community.
Explain the difference between the information given by a test of statistical significance, such as Chi Square, and a measure of association, such as Pearson's correlation coefficient.
A genetic experiment involving peas yielded one sample of offspring consisting of 414 green peas and 153 yellow peas. Use a 0.01 significance level to test the claim that under the same circumstance
"Assume that a simple random sample has been selected from a normally distributed population and test the given claim. Identify the P-value, critical value(s), and state the final conclusion that ad