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How do I find a standard error? I have a sample population of 100 A Sample mean of 396218 Stand Dev of 173427.56 A population

How do I find a standard error?

I have a sample population of 100

A Sample mean of 396218

Stand Dev of 173427.56

A population mean of 288407

I am ultimately looking for the test statistic

I have (396218-288407)/(i think my standard error is 17342.76) but am unsure

If correct I think I have a t stat of 6.216

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