Introduce the data set with columns the repeated observations of data. $$ A=\left(\begin{array}{ccc} 1 & 2 & 1.5 W 2 & 3 & 3.4 4 & 4 & 6.2 5 & 6.1 & 7.3 \end{array} ight) $$ a) What is the singular decomposition of $A$ as $U D V^{t}$. b) What is the closest rank one matrix to the data given by the columns of $A$ ? That is, perform data reduction on $A$. Of course 4 by 3 matrix CS. JG. 131