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Suppose X and Y are two random variables with joint PMF that is approximately bivariate normal. Suppose that observing X reduces your prediction standard deviation ofY by a factor of 2.5. What is the correlation between Y and X?
Calculate 95 percent and 99 percent confidence intervals for u(mean). Using the 99 percent confidence interval, can we be 99 percent confident that u(mean) is at least 42? Explain.
The same researcher wishes to estimate the proportion of executives who own a car phone. She wants to be 90% confident and be accurate within 5% of the true proportion. Find the minimum sample size necessary
A random group of 12 high school juniors were asked to estimate the average number of hours they study each week. The following give these hours along with the student's grade point average-Find the sample correlation coefficient between hours repo..
A sample of n = 5 scores has a mean of M = 12. If one person with a score of X = 8 is removed from the sample, what will be the value of the new mean?
What is your decision regarding the null hypothesis and interpret.
in the past patrons of a cinema complex have spent an average of 5.00 for popcorn and other snacks with a standard
Using a 95% confidence interval, estimate the minimum difference between the mean postexposure attitude score and the mean preexposure attitude score. (Round your answer to 2 decimal places.).
a backpack manufacturer produces an internal frame pack and an external frame pack. let x represent the number of
A pharmaceutical company wants o test a new cholesterol drug. The average cholesterol of the target population is 200 mg and they have a standard deviation of 25 mg. The company wished to test a sample of people who fall between 1.5 and 3.0 z sco..
a local tennis pro-shop strings tennis rackets at the tension pounds per square inch requested by the customer.
During nine days in a festival, the highest sale of a shop was on sunday and was 900„5 more than the average sale for other days. If the standard deviation of the sale during the festival is 33.33, find the standard deviation leaving that the highes..
a What is the role today of the Export-Import Bank of the United States? b. Describe the Direct Loan Program administered by the Export- Import Bank.
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