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Sixty-five elements were randomly sampled from a population that has 200 elements. the sample mean is 180 with a variance of 135. the distribution of the population is unknown. the standard error of the mean is

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CrypticGeek
Sample size = 65
mean = 180
variance = 135

Standard Deviation is square root of the variance. So standard deviation = 11.6
Standard Error of the mean = Standard Deviation  / square root of sample size
                                          = 11.6 / 8.06 = 1.44

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