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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?
If 200 of the adults surveyed were in the age category of 24 and under and they provided a standard deviation of $14.50, construct a 95% confidence interval for the weekly average expenditure on fast food for adults 24 years of age and under.
the expected mean life of a particular type of light bulb is 1000 hours with a standard deviation of 50 hours. the life
If the cost in millions of dollars, to remove x% of pollution in a lake modeled by C=6000/200-2x, how would I figure the cost to remove 75% of the pollution?
The safety coordinator of a manufacturing facility wishes to demonstrate that the mean time (in days) between safety incidents has deteriorated from the traditional 30 days. What are the appropriate null and alternative hypotheses?
Compute correlation loading coefficients using (a) the correlation matrix, and (b) the covariance matrix. How do the two sets of coefficients compare to each other? Are both sets equally informative? Explain (see also Exercise 3.23).
Given below are heart volume measurements taken on male athletes. Do heart volumes differ for male athletes who participate in different sports?
find the true mean purity level
How likely is it that the store owner will make at least $7,000 if she implements your suggestion?
A gambler plays a game in which on each play he wins one dollar with probability p and loses one dollar with probability q = 1 - p. The Gambler's Ruin problem is the problem of finding the probability wx of winning an amount T before losing everyth..
a sample of 132 motels is selected from a large urban area and the price for a night of lodging for a single room was
An experiment is conducted to determine the relationship between initial speed and stopping distance of automobiles. A sample of twelve cars is tested and the following data are recorded:
Discuss the subject matter in the article, and interpret the results and what the confidence interval and margin of error mean as they apply to the specific subject matter.
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