user133466
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 Dec16 asked Is the skill to learn new math by reading textbook alone (no lectures) required when one becomes a PhD student? Nov26 asked How to integrate $\int_{-\infty}^\infty e^{\frac{-(x-y)^2}{2}} dx$ Nov25 asked How is $e^x$ related to its probability density function $\lambda e^{-\lambda x} (x>0)$? Nov25 asked Moment generating function: why is $\int_{-\infty}^{\infty}\frac{1}{\sqrt{2\pi}}e^\frac{-(z-t)^2}{2} dz = 1$ Nov21 asked I don't understand why $X = \sum_{i=1}^n X_i$ and $Y = \sum_{i=1}^n Y_i$ Nov18 asked Why is $\operatorname{Var}(X+Y) = \operatorname{Cov}(X,X) + \operatorname{Cov}(X,Y) + \operatorname{Cov}(Y,X) + \operatorname{Cov}(Y,Y)$ Nov14 asked Does SSTR (sum of squares for treatments) = SSR (regression sum of squares)? Oct27 answered Derivate of $(\sin \theta)^{n-1}$ Oct27 asked what happens when you apply logarithm transformation to a data? Oct25 asked What is the $P( |X-10| > 2)$ of a normal distribution when mean is 10, and standard deviation is 6? Oct21 asked Stratified random sampling Oct17 asked Why is the greatest and least values for each group in these 2 frequency distribution unknown? Oct17 asked Calculating Variance of a binomial distribution using the standard formula $E(X^2) - \mu^2$ Oct11 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 Oct9 asked How can gender and class classification be dependent? Oct7 answered Probability given a mean and standard deviation of a random variable Oct6 asked Why can we use poisson distribution in this case? the n is very small!! Oct6 asked Is it possible to do this Poisson problem in Binomial? Oct4 asked Why does negative binomial random variable uses ${n-1 \choose r-1}$ instead of ${n \choose r}$ as coefficient? Oct3 asked Performing hypothesis test for the difference of population means: paired comparisons