ENV100Y5 Lecture Notes - Lecture 4: Endocrine System, Null Hypothesis
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ENV100Y5 Full Course Notes
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What is a bad hypothesis: a hypothesis that is untestable. Environmental science: we propose and test hypotheses to understand patterns and relationship in nature, and to understand the effects and consequences of human activities on the environment. Good hypotheses breed : when tested, give rise to lots of other hypotheses. Predictions give rise to study designs: compare the incidence of lung cancer in a group of. 1,000 males 65-70 years of age who have smoked for at least 20 years to a group of 1,000 males 65- 70 years of age who have never smoked. Good study designs: have adequate sample sizes, are unbiased, are achievable, have some kind of comparison (to a relevant control group, to previous conditions, etc. , are ethical. Rule of thumb: if you"re going to something that will cause harm, you must have an extremely strong argument for why it should be done .
