Using Smartpohons reduces's Students' GPA

have proposal research paper which is using smartphone reduces students' GPA.I attach the requirements . my research question which is (what the relationship between using smartphone and reducing students' GPA when I wrote for my professor my hypothesis which is a smartphone is helpful tool for students when they use in correct way my professor said ""not testable" i need to help me to do experimental for 2 groups so i need to write a good methodology as i said it is proposal research . if you need to change the hypothesis that is okay The professor does not need survey. Some resources :- 1- http://articles.chicagotribune.com/2013-03-06/health/sc-health-0306-cell-phone-gpa-20130306_1_text-messages-researchers-smartphone 2- https://www.mypath101.com/blog/posts/2015/01/08/study-shows-social-media-can-have-negative-impact-your-gpa#.VlUOLu1VhHx 3- http://www.newsnet5.com/news/local-news/akron-canton-news/kent-state-university-study-shows-high-cell-phone-usage-leads-to-lower-gpa-and-higher-anxiety 4- https://www.yahoo.com/parenting/how-smartphones-affect-kids-at-school-119384298537.html 5- http://blog.talkingphilosophy.com/?p=7696 6- http://learning.blogs.nytimes.com/2010/11/22/are-your-tech-habits-hurting-your-grades/?_r=0 7- http://www.makeuseof.com/tag/smartphone-body-mind/