Compare the lengths of the confidence intervals

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In a portion of a study of self-awareness, Dana observed the values

59, 106, 174, 207, 219, 237, 313, 365, 458, 497, 515, 529, 557, 615, 625, 645, 973, 1065, 3215.

Compare the lengths of the confidence intervals based on the mean and 20% trimmed mean. Why is the latter confidence interval shorter?

Reference no: EM131398669

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