its surely a 'myth' but there are no studies on it to prove either way.. oh wait there is one obscure study that is kind of relevant to support that it must be a myth. 

dig a little deeper... the 'stats can' study is bad data because other studies, many studies, have proven that immigrants just don't phone the cops. they may not even know how, they don't want to deal with it, language barriers.. real truths, not myths. they even phone ambulances at reduced rates.. you're working with bad data.

http://www.politifact.com/california/statements/2017/feb/24/kamala-harris/mostly-true-latinos-40-percent-less-likely-call-po/

https://thinkprogress.org/why-people-of-color-dont-call-for-an-ambulance-669462d88d47/

http://www.metronews.ca/news/calgary/2015/12/17/calgary-domestic-violence-studys-shows-fear-of-police.html

https://www.hrw.org/news/2014/05/14/us-immigrants-afraid-call-911

This is one of those scenarios where a lack of street smarts is showing. Head is too far into book, pull-out!