Schweser pg 325 Support for the hypothesis question hypothesis, conclusion, question, support, higher

slackeranalyst

Hi,
On pg 325 of Schweser’s Book 1, it says “we have support for the hypothesis that betas are lower as a result of deregulation…” how did Schweser come up with that conclusion? Can’t it be the other way, betas are higher as a result of deregulation?
How to tell bascailly?