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Question: His and her earnings Researchers randomly select a married couple in which both spouses are employed. Let X be the income of the husband and Y be the income of the wife. Suppose that you know the means mX and mY and the variances s2X and σ2Y of both variables.
(a) Is it reasonable to take the mean of the total income X + Y to be μX + μY? Explain your answer.
(b) Is it reasonable to take the variance of the total income to be σ2X + σ 2Y? Explain your answer.
consider two values r 0.08 and r ?0.58. describe them in relationship to each other. describe the clinical importance
Assume that the standard deviation of college student IQ's is 10. A random sample of 100 students from a college showed an average IQ of 110. Compute a 95% confidence interval for the mean IQ of students attending this college.
Assume the life of these light bulbs follows a normal distribution. Find the probability that a random sample of 100 light bulbs will have an average life between 1760 and 1775 hours.
What method of random selection can be used to determine which women to select in quantitative research?
You are given two boxes: one of them containing 900 red marbles and 100 blue marbles, the other one contains 500 red marbles and 500 blue marbles. If we pick one of the boxes randomly. and pick a marble what is the probability that it is blue? If we ..
The winning number might be, for example, either 2873 or 9999. Explain why these two outcomes have exactly the same probability.
Medicine and Clinical Studies The normal blood platelet count for an adult ranges from 150,000 to 400,000, with a standard deviation of approximately 62,500.
A random sample of 12 single men were asked if they would welcome a woman asking them for a date. using the binomial probability table, find the probability that: none of the men will say yes.
Construct a 99% confidence interval for the difference in the probabilities of getting a fracture for non-cola drinking and cola drinking kids.
Using the data for women, complete an analysis of CHD incidence in women similar to the one completed for men.
a manager is trying to decide whether to buy one machine or two. if only one is purchased and demand proves to be
Let M(t) be a wide sense stationary random process with average power E[M2(t)] = q and power spectral density SM ( f ). The Hilbert transform of M(t) is (t), a signal obtained by passing M(t) through a linear time-invariant filter with frequency resp..
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