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However, it is better to be definite get the real n 1 and n 2.The t.

If you want to get the answers accurate then, you must know the right formula and put the values correctly.

Now, you know the formula so, you should put the values accordingly to get the required solution. If you were using the median instead of the mean to estimate the population median (which would not be wise for Normally distributed data as the mean is a better estimator for what is ultimately the same quantity the mean and the median are equal), you would have a different standard error, a larger one. In this case n 122 you would need to be given n 1 and n 2.Otherwise assume n1 and n 2 are equal then n 1 61 and n 2 61. The standard error of the estimate is a measure of the accuracy of predictions made with a regression line. To calculate the standard error, here is the formula that you must know: SE theta / square root n. At this point your estimate of the standard error is $\frac$, where $\sigma$ is the population standard deviation we use $s$ instead of $\sigma$ (usually presumed to be unknown) to estimate the standard error.