I'm having some problems understanding this question related to the bootstrap method:

Generate a sample from from the uniform distrubition on

We pretend not to know of (which is in fact 10) and try two estimators for this parameter:

To choose between and we are interested in the MSE and . We can estimate these by inserting an estimator in the expressions of their expectation value and variance. Determine a based on the data to do this and compare the answers.

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I found the expectation value of both and , but I have no idea what is meant by inserting an estimator , and how to determine this from a given 25 draws from the distribution. Could someone help me by explaining this?