ENV100H1 Lecture 1: ENV100Y5 Lecture 4 MODULE 1

• School: UTSG
• Department: School of Environment
• Course: ENV100H1
• Professor: Murck Barbara

Document Summary

Lecture 4- how science is done: an aside on hypotheses. We propose and test hypotheses to understand patterns and relationships in nature, and to understand the effects and consequences of human activities on the environment. When tested, give rise to lots of other hypotheses. A provisional statement that proposes a possible explanation for a particular observed phenomenon. E(cid:454)pe(cid:396)i(cid:373)e(cid:374)tal (cid:396)esults a(cid:396)e a(cid:374)al(cid:455)zed to see (cid:449)hethe(cid:396) the(cid:455) suppo(cid:396)t the (alternate) hypothesis or the null. Ha: cigarette smoking increases the probability of developing certain types of lung cancer. H0: cigarette smoking has no effect on the probability of developing certain types of lung cancer. What you expect to happen if your hypothesis is true (in terms of measurable results) If cigarette smoking increases the probability of developing certain types of lung cancer, then the incidence of lung cancer should be higher in a group of heavy, lifetime smokers than in a comparable group of non-smokers.