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The sample standard deviations for two independent samples of size 20 each are 12 and 15. What is the estimate of the pooled standard deviation? Give your answer to 2 decimal places.
A state representative is reported as saying that about 10% of reported auto thefts involve owners whose cars have not really been stolen, but who are trying to defraud their insurance company.
in each of the following situations the sampling frame does not match the population resulting in undercoverage. give
Test this conjecture with formal hypothesis test, by using a 5% significance level. Find out the p-value for hypothesis test.
What additional strategies (up to 3) you would propose that may increase validity of the findings.
Find the 99% confidence interval for the population proportion.
Let μ be the hourly wage (excluding tips) for workers who provide hotel room service in a large city. A random sample of a number (more than 30) of such workers yielded a 95% confidence interval for μ of $8.46 to $9.86 using the normal distributio..
Let (X,Y) have uniform distribution on the four points (-1,0), (0,1), (0,-1), (1,0). Show that X and Y are uncorrelated but not independent.
the umuc daily news reported that the color distribution for plain mampms was 35 brown 20 yellow 20 orange 15 green and
find the product of the vector of state probabilities for the preceding period and the matrix of transition probabilities.
A new book is being released and a bookstore predicts that 70% of customers that walk through the door on the release day will purchase the book.
use technology to construct the confidence intervals for the population variance ?2 and the population standard
a trucking firm delivers appliances for a large retail operation. the packages or crates have a mean weight of 298 lb.
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