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1. Find the mean. and the varial)ce of Y = x, -2X2 + 3X3, where X., X 2 , X 3 are observations of a random sample from a chi-square distribution with 6 degrees of freedom.
2. Let X and Y be random variables such that var (X) = 4, var ( Y) = 2, and var (X + 2Y) = 15. Determine the correlation coefficient of X and Y.
3. Let X and Y be random variables with means µ1 ,µ2 ; variances of , ; and correlation coefficient p. Show that the correlation coefficient of W = ax + b, a > 0, and Z = c Y + d, c > 0, is p.
the rent for a one-bedroom apartment in southern california follows the normal distribution with a mean of 2475 per
Show the sampling distribution of p and what is the probability the Times/CNN poll will provide a sample proportion
imagine that exam 1 for statistics 2160 this term will have 62 questions. each question has 5 multiple choice options
one of the requirements of linear regression is homoscedasticity of the residuals. this means that .a. the sizes of the
Write a 700- to 1,050-word paper describing how information systems are changing various aspects of the accounting profession. Include a description of several new technologies and their effects on accounting processes.
Select another sample of 30 scores from the same population, what measure of central tendency is likely to vary least between your first and second sample?
What decision would be made if the researcher used a one-tailed test with an alpha level of .05? (Assume that the herb is expected to increase scores.)
The first salesperson to find a strong leader will win the account. Do the three salespeople have the same chance of winning the account? If not, find their respective probabilities of winning.
According to an article, 19% of the entire US population have high-speed access to the Internet. Random samples of size 200 are selected from the US population.
for each of these items be sure to sketch the graph and shade the are of interest. scores on a standarized exam are
in a random sample of 400 minnesota residents 330 have home internet access whereas in a random sample of 900 wisconsin
a researcher wanted to investigate whether there was a difference in satisfaction ratings in an assisted living
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