Obtain a linear regression plot and extrapolate the result to predict the material loss in the O'ring at the time of the disastrous Challenger launch. Assume that the O'ring was at the launchpad ambient temperature, $29$ degrees $F.$

$($a$)$ Compute the correlation coefficient, $r.$

$($b$)$ Comment on the meaning of $r$ and $r^2.$ How relevant would this be in arguing for no launch?