Describe the conflict between humayun and sher shah​

When Humayun was busy in conquering Gujarat, Sher Shah Suri strengthened his position in Bihar and Bengal. He also cut off his (Humayun) line of communication with Agra. In the Battle of Chausa, in 1539 CE, Humayun troops were defeated by the sudden attacks of Sher Shah Suri's army

Explanation:

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.