user133466

441 reputation

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visits	member for	9 months
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	441 reputation	bio	website		visits	member for	9 months
13 badges		location			seen	Jan 22 at 17:08

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35 Posts

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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)?
Nov 4	asked	Using normal distribution to approximate binomial distribution (continuity correction)
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?