An employee at a coffee shop hypothesizes that the harder the espresso grounds are tamped down into the portafilter before​ brewing, the longer the separation time of the​ heart, body, and crema will be. The accompanying data table shows the results of this experiment. The independent variable tamp measures the​ distance, in​ inches, between the espresso grounds and the top of the portafilter. The dependent variable time is the number of seconds the​ heart, body, and crema are separated. Complete parts​ (a) through​ (f) below