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Suppose X and Y have joint density f(x,y). Are X and Y independent if:
(a) f(x,y) = xe^-x(1+y) for x,y >= 0
(b) f(x,y) = 6xy^2 when x,y >= 0 and x+y <= 1
(c) f(x,y) = 2xy + when 0 < x < 1 and 0 < y < 1
(d) f(x,y) = (x+y)^2 - (x-y)^2 when 0 < x < 1 and 0 < y < 1
*If domain is not rectangular, then f(x,y) does not equal f(x)*f(y).
Show domains and calculations for f(x) and f(y).
Suppose that 50% of all people are opposed, evaluate probability of getting at least 89% opposed in survey of 1012 randomly selected people.
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At α = 0.01 level of significance, test the hypothesis that these data can be described by a Poisson pdf.
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Has there been a significant decrease in the proportion of students who change their major after the first year in this program? Test at the .05 level of significance.
For thefts involving more than $1,000, there is an inverse relationship between the value of the goods stolen and the length of the prison sentence given to the thief.
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