Step 2: Formulate a Hypothesis Formulate a hypothesis by making an explicit statement about the cause of the common cold based on the observations and generalizations you made in Step 1. based on the 3 things below HypothesisObservation 1: Common cold is caused by bacterial or viral infection and transmitted from one person to other through droplets from infected person. The person infected with common cold show protect his nose or mouth with steril mask, which covers mouth and nose. If nose or mouth is not covered by mask, droplets can transmit common cold to many people in surrounding environment. Observation 2: Common cold is widely transmitted very easily, if a person infected with common cold and he sneezes in public places which is having high population, several thousands of droplets can be transported through air at onetime, when person sneezes, so avoid moving in public places when common cold is rampant in specific area. Observation 3: Doctors who examine the persons suffering with common cold should be careful, the physician should use antibiotics or vaccines to prevent common cold infection. Solution The hypothesis is this statement: Common cold is a viral infectious disease which can be transmistted from one person to another on sneezing.It can be prevented by taking antibiotics and vaccines by the physicians while check-up..