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seen Sep 13 '13 at 23:49

Sep
13
accepted How do we identify a probability problem as a conditional probability problem?
Dec
16
accepted Is the skill to learn new math by reading textbook alone (no lectures) required when one becomes a PhD student?
Nov
28
accepted How to integrate $\int_{-\infty}^\infty e^{\frac{-(x-y)^2}{2}} dx$
Nov
26
accepted How is $e^x$ related to its probability density function $\lambda e^{-\lambda x} (x>0)$?
Nov
26
accepted Is it possible to do this Poisson problem in Binomial?
Nov
25
accepted Moment generating function: why is $\int_{-\infty}^{\infty}\frac{1}{\sqrt{2\pi}}e^\frac{-(z-t)^2}{2} dz = 1$
Nov
21
accepted I don't understand why $X = \sum_{i=1}^n X_i$ and $Y = \sum_{i=1}^n Y_i$
Nov
18
accepted Why is $\operatorname{Var}(X+Y) = \operatorname{Cov}(X,X) + \operatorname{Cov}(X,Y) + \operatorname{Cov}(Y,X) + \operatorname{Cov}(Y,Y)$
Nov
15
accepted Does SSTR (sum of squares for treatments) = SSR (regression sum of squares)?
Oct
25
accepted What is the $P( |X-10| > 2)$ of a normal distribution when mean is 10, and standard deviation is 6?
Oct
18
accepted Why is the greatest and least values for each group in these 2 frequency distribution unknown?
Oct
17
accepted Calculating Variance of a binomial distribution using the standard formula $E(X^2) - \mu^2$
Oct
11
accepted By convention $P[X=x] = 0$ for all x. How would you explain pdf $f(x) =3x^2$ (where x is between 0 and 1) when x =0.9
Oct
9
accepted Why does negative binomial random variable uses ${n-1 \choose r-1}$ instead of ${n \choose r}$ as coefficient?
Oct
7
accepted Why can we use poisson distribution in this case? the n is very small!!
Oct
5
accepted Performing hypothesis test for the difference of population means: paired comparisons
Sep
22
accepted Probability in flipping a coin
Sep
22
accepted Why are these two events not independent?
Sep
21
accepted Winning game of craps?
Sep
20
accepted Why aren't these events mutually exclusive?