When conducting an experiment on time management, jamie assigns everyone who arrives before noon to the experimental group and everyone who arrives after noon to the control group. in the context of experimental research methods, what is wrong with jamie's experiment?

According the context of experimental research methods, it is wrong that Jamie has not used random assignment.
Because Jamie assigns everyone who arrives before noon to the experimental group and everyone who arrives after noon to the control group there is no randomness in the data he gets from the experiment. 
Using random assignment would be if Jamie assigns the participants to different groups no matter when they arrive, (using randomization). 

Ifeel like this means that we shouldn't just live for ourselves.also, we should respect others as well as people around us. it reveals that everyone should have equalized freedom, no matter their differences: races, cultures, skin color, etc,. we all deserve the same privileges.