Standard Error

describe in detail : standard error of a statistic

What is the standard error of the difference between two sample proportions, $(P_x-P_y)$

The standard error of the sample proportion under $H_0$?

Find standard error of the sample mean given that the variance of a given sample of size $150$ is $144$

If a random sample of $10$observations has variance $625$ then standard error is

Calculate standard error of the sample means, when sample mean is $100$, sample size is $25$ and population standard deviation is $50$.

Calculate standard error of the sample means, when sample mean is $100$, sample size is $64$ and population standard deviation is $24$.

What is the standard error of the difference between two sample proportions, $(P_x-P_y)$

Standard error of the sample mean is