Compare the lengths of the confidence intervals based on


In a portion of a study of self-awareness, Dana (1990) 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?

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Basic Statistics: Compare the lengths of the confidence intervals based on
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