Please use Minitab with data below, when I do the Tsq$-$GV option I get an error that says "Graph cannot be created because there are no valid data"

If I use Tsq i get a graph

In an electrolysis process, electrical current passes through a concentration of brine solution where

anode and cathode are separated by a porous diaphragm. Chlorine is displaced as a gas and the

remaining water$/$brine solution contains the caustic. The following variables are used to jointly

control the process: $x_1$ caustic $(NaOH),x_2$ salt $(NaCl),$ two kinds of impurities $I_3$ and $I_4,$ and cell

gases $x_{5}C{l}_2$ and $x_6{O}_2.$ The target values for the mean vector are

$0=\left[\begin{array}{c}{}_1\\ {}_2\\ {}_3\\ {}_4\\ {}_5\\ {}_6\end{array}\right]=\left[\begin{array}{c}140\mathrm{.}50\\ 195\mathrm{.}00\\ 0\mathrm{.}14\\ 2\mathrm{.}40\\ 98\mathrm{.}25\\ 1\mathrm{.}30\end{array}\right]$

The data for the phase I $T^2$ control chart are in the following table. $($a$)$ Create the phase one $T^2$

control chart using the following Minitab commands and comment on the state of control. If any

vectors are out of control, omit them and re$-$estimate the $T^2$ control chart. What is the one

observable difference between a phase one $T^2$ control chart and a phase one Shewhart X$-$bar

control chart? $($b$)$ Create a phase one MEWMA control chart on the in$-$control data from the $T^2$

control chart using $=0\mathrm{.}2.$ Does the process show any steps or drifts?

Stat $>$ Control Charts $>$ Multivariate Charts $>$ Tsquared

In the "Variables:" input box select Pb $3$ X $1$ Pb $3$ X $2$ Pb $3$ I $3$ Pb $3$ I $4$ Pb $3$ X $5$ Pb $3$ X $6$ with a single

space between each variable name.

In the "Subgroup sizes:" input box select PB$3$Subgp

Click on the $$ Tsq$-$GV Options$>$ button. On the "Parameters" tab, type in the mean vector

values above with a single space between each mean value.

Click the OK and OK buttons.