Biology 2244A/B Lecture Notes - Lecture 1: Block Design, Response Bias, Cohort Study
15 Sep 2020
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Lecture 1 & 2 ( focusing on chapter 7&8 ) Observational studies collect information without interacting with the environment. Experiments impose some kind of treatment and see how it affects the environment. Explanatory variable are the x" variable, manipulated to seek change. Response variables are the y" variable, measured and observed. Confounding variables are two variables that can not be distinguished from one another that have an effect on the response variable. Wine drinkers are typically also wealthy and eat better so it might not actually be the wine that is making the difference. In the case that there is a confounding variable, it is known as the lurking variable. Parameter - actual proportion of population that exhibit the trait p=(x/n). Variable - what trait is it that varies / we care about. Sample - people who responded to the survey (n). Statistic - estimated proportion of population that have the trait using the sample p^ = (x/n).
