bakit 19 respondents lang? napakakonti nun. tas quantitative pa yung study mo pangit result nun at hindi reliable. Ilan ba population covered ng study mo. then from that population kumuha ka ng sample.. Sa sampling technique naman, pwede kang gumamit ng probability sampling (recommended because quantitaive study mo) like ramdom sampling, systematic, stratified sampling etc. O kaya non-probabilty sampling (usually used in qualitative study pero pwede naman ito gamitin for convenience mo) like purposive sampling, quota sampling, convenience sampling etc. Magpaadvise ka rin sa adviser mo kung ok yang kinuha mo sample. About naman sa statistical technique na gagamitin mo. depende yan sa objective mo o ibased mo sa chapter 1 statement of the problem mo. Hinahanap mo ba ay kung may relationship sa academic performance? pwede mo gamitan ng correlation or mas advance ay regression dahil kukuhain mo rin yung effect nun, bukod sa relationship lang.. Pero based nga sa respondents mo, hindi magiging reliable ang magiging result nun. Kung hinahanap mo naman significant difference, may t-test, anova. Gets mo ba?hahaha