Statistics Help @ Talk Stats Forum - Probability
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Probability course and homework discussion. Probability distributions. Probability theory, stochastic processesenMon, 24 Nov 2014 07:57:21 GMTvBulletin60http://www.talkstats.com/images/misc/rss.pngStatistics Help @ Talk Stats Forum - Probability
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When does the Normal Distribution arise?
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Sun, 23 Nov 2014 21:57:08 GMTHello guys, Studying the multivariate normal distribution (and the univariate one as well), I found in Muirhead (1982) that the normal distribution...Hello guys, Studying the multivariate normal distribution (and the univariate one as well), I found in Muirhead (1982) that the normal distribution arises when "the
observations themselves can be regarded as sums of independent random
vectors or effects". Mi question is if every time observations regarded as sums of independent random effects follow a (more or less) normal distribution? Mi intuition says no, but I have not been able to find an answer to this. I would be really grateful if someone can provide a counterexample or an explanation to this.

Thanks a lot!

Axs
]]>ProbabilityAxs_Souzahttp://www.talkstats.com/showthread.php/58578-When-does-the-Normal-Distribution-ariseHard probability question/game-binomial dist.
http://www.talkstats.com/showthread.php/58564-Hard-probability-question-game-binomial-dist.?goto=newpost
Sat, 22 Nov 2014 14:58:43 GMTConsider 50 people and series of 10 rooms. Each room has, for example, 5 doors that will open to the next room with known (totally known, including...Consider 50 people and series of 10 rooms. Each room has, for example, 5 doors that will open to the next room with known (totally known, including in later rooms), but different probabilities.

Everyone begins in room 1, and each person selects a door. If that door opens, all of the people that selected that door go into room 2. If not, they are all "out". the survivors then play the game in room 2 to get into room 3, and so on.

My goal is to allocate the people to the doors so to maximize the chance that at least one person gets through all of the rooms. The 2 people 2 room 2 door case is fairly easy to solve, and certainly there are several generalities like if p=1, everyone pick that door, but I'm looking for solutions or general principles for the harder cases.

Thanks very much for the help-this is not homework.
]]>Probabilitybhr23http://www.talkstats.com/showthread.php/58564-Hard-probability-question-game-binomial-dist.Distribution
http://www.talkstats.com/showthread.php/58550-Distribution?goto=newpost
Fri, 21 Nov 2014 14:11:41 GMT= 0 and γ>= 0, such that
γ <= B. Which...]]>Hello, I having doubts on this issue

1) If X~Gamma(a,B) and Y~Beta(γ,B-γ), respectively with B>= 0 and γ>= 0, such that
γ <= B. Which distribution Z= XY?

I tried Jacobian, convolution integral, but I can not get anything
]]>Probabilityaskazyhttp://www.talkstats.com/showthread.php/58550-Distribution