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A pollster wants to determine the difference between the proportion of high-income voters and low-income voters who support a decrease in the capital gains tax. If the answer must be known to within
Find the marginal probability functions fx(x), fy(y), fY|X=x^*, E[fy|X=x^*].Find FZ(z) and fZ(z), E[Z], Var[Z].find px(x), py(y), mu(x), mu(y), row(x)^2, row(y)^2, e(X,Y).
The optimal time to harvest would be at the exact moment of the freeze-harvesting either earlier or later involves a loss relative to the value of the crop at that optimal point in time. The farmer
Given a joint distribution fX,Y(x,y)= (1/(2x^2y)), if 1<x<infinity and 1/x<y<x. and 0, otherwise. Find the marginal probability distribution functions fx(x), fy(y). Are X and Y independe
If X and Y have the joint probability distribution function fx,y(x,y)= ((x+2y)/2^2), for (x,y)= {(1,1),(1,3),(2,1),(2,3)}. and 0 elsewhere. Find the Cov(X,Y) and e(X,Y).
Do cars that weigh 5000 Pounds have a stopping distance above or below the average? What is its residual? G. Are there any outliers in the data?
Is the difference important? or does teh question make sense? b)does it make sense to ask if the difference is statisically significante? can you answer on the basis of the informations given?
What is the probability trading volume will be less than 400 million shares? b. What percentage of the time does the trading volume exceed 800 million shares? c. If the exchange wants to issue a pre
Find the probability that a given class runs less than 51.5 minutes. Find the probability of selecting a class that runs less than 51.5 minutes."
The only possible, mutually exclusive outcomes of the surgery are death, relief of symptoms, (angina, dyspnea), or continuation of symptoms. The probability of death is 0.02 and the relief of sympto
If the mailing list can be considered a random sample of the population, what is the chance that at least 1245 Macintosh users will receive the flyer?
Sketch (roughly) the sampling distribution of the mean tile number. Explain why the sampling distribution has this shape.(e) What are the mean and standard error of your sampling distribution?
SAT verbal scores are normally distributed with a mean of 494 and a standard deviation of 97. Use the Empirical Rule to determine what percent of the scores lie between 300 and 591.
What size random sample should you take if you want to estimate the annual salary in the population with 99 percent confidence and a maximum margin of error of $250?
if you want to be 95% confidence of estmating the population mean to within a sampling error of +-4 and the standard deviation is assumed to be 10, what sample size is required?
As a result of these findings, he asks the following question: Do students differ in terms of the points they earn in the course based on race and delivery environment?
Determine if there is convincing evidence to support the claim that fewer than half of adult Americans can name at least one justice currently serving on the Supreme Court.
Let p1 and p2 be the proportion of all cars of this model in 2003 and 2004, respectively, that actually have the defect. What is a 90% confidence interval for p1 - p2?
using the normal distribution with a known population standard deviation. Find the value of x for this sample. Find a 99% confidence interval for μ based on this sample.
A random sample of size 16 is chosen from a population and a 90% confidence interval for the standard deviation will be determined. What value of should be located in the chi-square distribution tab
An automobile dealership has as one of its performance goals. Does this sample data provide evidence that the dealership is not meeting its performance goal?
For the experiment above, let X denote the number of hearts that are drawn. For this random variable, find its expected value and standard deviation.
What is the optimal order quantity without instantaneous receipt (material is accepted over time)? What is the average dollar value of inventory without instantaneous receipt (material is accepted ove
95% confidence interval for the average price of a gallon of regular gasoline in our state is from $3.15 to $3.45. Use the fact that the confidence interval for the mean is in the for x- E to x+ E t
Two components of reliability 0.95 are in parallel and this subsystem is connected in series to a component with a reliability of 0.90. Calculate the overall reliability of this system.