Question: For independent random samples selected from the ???? and ???? populations what is the formula for computing the (a) SE(???????? ????????)? (b) se(????????

For independent random samples selected from the ???? and ???? populations what is the formula for computing the

(a) SE(ˆ???????? − ˆ????????)?

(b) se(ˆ???????? − ˆ????????)?

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