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A researcher measures the mean test score from a random sample of 100 students and finds the standard error to be 3 points. If the researcher instead samples 400 students from the same population (with the same population standard deviation), what is the new standard error?
A researcher measures the mean test score from a random sample of 100 students and finds the standard error to be 3 points. If the researcher instead samples 400 students from the same population (with the same population standard deviation), what is the new standard error?