PSYCH 241 Lecture Notes - Lecture 9: Design Of Experiments, Descriptive Statistics, Minimax
18 Oct 2016
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Document Summary
Had an interesting scientific question (cognitive control) Came up with a well formulated hypothesis. Incongruent label will cause slower rts and reduced accuracy. Conducted a well designed experiment: high internal and external validity - sensitive and reliable. Sitting on a pile of data - wanting to make sense of it. Challenge is to make the strongest case possible - provide evidence for or against the hypothesis. Inspect the data carefully, identify errors in the data, consider whether the data make sense, or not: test the shape of the distributions - difference score. Summarize the data: use descriptive statistics (central tendency, variability, effect size, and graphical displays of data, measures of central tendency. Mean: sum of scores divided by number of scores (average) Mode: most frequent score in distribution (can be more than one mode: measures of variability. Range of scores: difference between highest and lowest (max/min)
