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Competitive Stats
Q35Section B (Section B)35 of 60

Matrices that can be a variance-covariance matrix

Which of the following matrices can be the variance-covariance matrix of a random vector X=(X1X2)X=\begin{pmatrix}X_1\\X_2\end{pmatrix}?

Multiple select: one or more options are correct. Select all of them, then submit — marks need the exact set.

Options

Select every correct option, then submit.