user133466
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 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 the mean is 10, and the 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