PSYCH 2300 Lecture Notes - Lecture 3: Operationalization, Null Hypothesis, Random Assignment
8 Feb 2018
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New study tests how diff types of exercise affect attentional control . Diff groups will sit, stand, walk, or run. To put conceptual variables into useable form. Claim: the argument someone is trying to make. Ex) learning style is related to academic performance. Ex) shy ppl are better at reading facial expressions. Ruled out the possibility of external explanations. Get close to this by random assignment. The appropriateness of a conclusion or decision. Internal: how well the causal claim holds up. How large is the margin of error around this estime? (i. e how close is our estimate to the actual rate) Null hypothesis (h0) - there is no significant covariance. Alternative hypothesis - there is significant covariance (the claim we"re making) Like a doctor reading an x-ray and thinking there"s a tumor, when really there isn"t one. Case a: reports from early studies suggested that smoking does not increase cancer risk.
