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Given jointly distributed random variables, X1 and X2, prove that, for any x2 and almost all x1 , FX2|X2(x2| x1) = Fx2(X2) if and only if X1 and X2 are independent.
in a particular occupation a random sample of 210 men found that 65 smoked. in a random sample of 240 women 87 smoke.
What is meant by the problem of direction of cause and effect and the third-variable problem?- How do direct experimental control and randomization influence the possible effects of extraneous variables?
Is there any evidence to suggest that the populations are different? Use a = 0.01.
Each year the local country club sponsors a tennis tournament. Play starts with 128 participants. During each round, half of the players are eliminated.
To what population do you think the results of this study apply? If you need more information to answer this question.
One theory concerning the S&P 500 index is that if it increases during the first five trading days of the year, it is likely to increase during the entire year.
1.a study was conducted to explore the relationship between a childs birth order and his or her chances of becoming a
If the variability of the filling machine is reduced to 0.025 ounce, verify that this will lower the required average amount of coffee to 4.050 ounces and yet keep 98 percent of the jars above 4 ounces.
test the claim that the mean body mass index (BMI) of men is equal to the mean BMI of women. Use Excel and/or SPSS to perform the hypothesis test.
Design a nonequivalent control group pretest-posttest quasi-experiment to test this claim. Include a well-reasoned dependent measure as well.
a lumber mill is tested for consistency by measuring the variance of board thickness. the target accuracy a variance of
a competency test has scores with a mean of 69 and a standard deviation of 4. a histogram of the data shows that the
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