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visits member for 2 years, 3 months
seen Sep 13 '13 at 23:49

Dec
16
asked Is the skill to learn new math by reading textbook alone (no lectures) required when one becomes a PhD student?
Nov
26
asked How to integrate $\int_{-\infty}^\infty e^{\frac{-(x-y)^2}{2}} dx$
Nov
25
asked How is $e^x$ related to its probability density function $\lambda e^{-\lambda x} (x>0)$?
Nov
25
asked Moment generating function: why is $\int_{-\infty}^{\infty}\frac{1}{\sqrt{2\pi}}e^\frac{-(z-t)^2}{2} dz = 1$
Nov
21
asked I don't understand why $X = \sum_{i=1}^n X_i$ and $Y = \sum_{i=1}^n Y_i$
Nov
18
asked Why is $\operatorname{Var}(X+Y) = \operatorname{Cov}(X,X) + \operatorname{Cov}(X,Y) + \operatorname{Cov}(Y,X) + \operatorname{Cov}(Y,Y)$
Nov
14
asked Does SSTR (sum of squares for treatments) = SSR (regression sum of squares)?
Oct
27
answered Derivate of $(\sin \theta)^{n-1}$
Oct
27
asked what happens when you apply logarithm transformation to a data?
Oct
25
asked What is the $P( |X-10| > 2)$ of a normal distribution when mean is 10, and standard deviation is 6?
Oct
21
asked Stratified random sampling
Oct
17
asked Why is the greatest and least values for each group in these 2 frequency distribution unknown?
Oct
17
asked Calculating Variance of a binomial distribution using the standard formula $E(X^2) - \mu^2$
Oct
11
asked 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
asked How can gender and class classification be dependent?
Oct
7
answered Probability given a mean and standard deviation of a random variable
Oct
6
asked Why can we use poisson distribution in this case? the n is very small!!
Oct
6
asked Is it possible to do this Poisson problem in Binomial?
Oct
4
asked Why does negative binomial random variable uses ${n-1 \choose r-1}$ instead of ${n \choose r}$ as coefficient?
Oct
3
asked Performing hypothesis test for the difference of population means: paired comparisons