A useful hypothesis allows prediction and within the accuracy of observation of the time, the prediction will be verified. As the accuracy of observation improves with time, the hypothesis may no longer provide an accurate prediction. In this case, a new hypothesis will arise to challenge the old, and to the extent that the new hypothesis makes more accurate predictions than the old, the new will supplant it. Researchers can also use a null hypothesis, which states no relationship or difference between the independent or dependent variables.
A usEful hypothesIs Allows PrEdiction and WIthin the accURacy oF oBsERvATioN oF thE TimE, tHe prEdiCtion WIll bE VerIfied. as The Accuracy of obsErvaTioN iMpROVeS with tiMe, the hypothesis May NO LOngEr providE an acCUrate prEdictioN. IN This CaSe, a neW HypothESis wiLl aRise to cHaLleNgE The old, anD To the EXtent ThAt the New hypotheSis makes MOre accuraTe preDIcTIoNs tHan the OLd, the new Will SUPpLant iT. researcherS Can alSo Use a null hypoTheSis, WhIch sTateS nO RElationsHIp OR dIfFeReNcE bETWeen The independeNt Or dePENdEnt vARiABles.