The standard deviation of a variable is 10. If a sample of 75 individuals is selected, Part 1 of 2 (a) Find the standard error of the mean. Round the answer to three decimal places. Standard error of the mean 1.155 Part: 1 / 2 Part 2 of 2 (b) Find the sample size needed to cut the standard error of the mean in half. Round intermediate calculations to three decimal places and round your final answer up to the nearest whole number. Sample size= X

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