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Suppose that you have a sample of 500 observations on two random variables: price denoted as X, and profit, denoted as Y. So you observe {xi, yi} for i=1,...500. Write down the formula for sample mean and sample variance of X and Y as well as the sample covariance between X and Y
When sampling is from a population with mean 53 and standard deviation 10, using a sample of size 400, what are the expected value and the standard deviation.
Determine the standard deviation of difference between Sarah's and Richard's scores?
a. Calculate the probability that the sample proportion will be within ±0.05 of the population proportion. b. Calculate the probability that the sample proportion will be within ±1 standard error of the population proportion.
Of the adults in Jefferson County, 10 percent have had CPR training. For a randomly selected group of students from this county, how large will the group have to be in order for the probability that have as a minimum one group member has had CPR t..
One theory concerning the Dow Jones Industrial Average is that it is likely to increase during U.S. presidential election years.
The following chart summarizes the selling price of homes sold last month in the Sarasota, Florida, area. a. What is the chart called?
What is the present value of an annuity of $6,200 per year, with the first cash flow received three years from today and the last one received 25 years.
some laboratory furnace have small glass windows so that samples may be observed. one problem associated with such
There are ten black, ten white, and ten blue balls in an urn. Ten of these are chosen at random without replacement. Find the probability that the first blue ball is drawn on the sixth draw.
There were 2018 people who answered the question about their own education and 1780 who answered the question about the education of their mothers.
The p-value obtained in a hypothesis test for population mean is 8%. Select the most precise statement about what it implies. Explain why the other statements are not precise, or are false.
1. an opinion poll asked british columbians are you in favour of a las-vegas-style casino in vancouver? yes or no. a
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