Elance Exams Answers PDF file

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Let X be a 3x4 matrix with non-zero values. The result of: > apply(X, 2, mean), is:

equal to the result of: >c(mean(X[,1]), mean(X[,2]), mean(X[,3]))
equal to the result of: >c(mean(X[1,]), mean(X[2,]), mean(X[3,]), mean(X[4,]))
equal to the result of: >c(mean(X[,1]), mean(X[,2]), mean(X[,3]), mean(X[,4]))
equal to the result of: >c(mean(X[1,]), mean(X[2,]), mean(X[3,]))
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