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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
20
accepted Why aren't these events mutually exclusive?
Sep
19
accepted Probability question at listing number of outcomes in the sample space.