Investigators want to apply a control program project to compare between waiting time and satisfaction of the patients $($ there was $2$ graph $)1$st show pre program $($ negative relation $)2$nd show post program $($ positive relation $),$ what is your interpretation?

Program is not effective

We should not use scatter plot to show his data

$2$nd show post program $($ negative relation $)$

There was other factor than waiting time affect the satisfaction of the patients