> - 42% are hopeful or excited about the tech industry

doesn't that ignore the overlap?

  1102 of 4694 (23%) respondents said they were hopeful 
   897 of 4694 (19%) respondents said they were excited

So, for example, if all of the ones who were excited also said they were hopeful, then only 23% of respondents are "hopeful or excited about the tech industry".

(on that question they could submit more than one answer)