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 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 the mean is 10, and the 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.