Question: Form the design matrix X (note: use a capital X!). This can be done by combining a column of 1's with a column of x

Form the design matrix X (note: use a capital X!). This can be done by combining a column of 1's with a column of x the father's heights.

X = cbind(rep(1,N), x)

Now calculate , the inverse of X transpose times X. Use the solve() function for the inverse and t() for the transpose. What is the element in the first row, first column

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