I've drawn that statement from the abstract of a paper published in March by Australian economist David W. Johnston. The paper itself is behind a payment barrier. I read a report about it at Do Employers Prefer Blondes?.
Apparently they do, to the tune of the equivalent of one additional year of education.
Is there any need to repeat? Jobs are about marketing, not objectivity.
wisestamp is nicer than this! Go have a look.
Change the items you want to use, blank out those you don't.
Once you are satisfied that you've got what you want copy and paste the entire contents of the result box into the signature area of your email software.
See email Signatures for more information.