PSY 102 Chapter 2: Chapter 2 notes
7 Nov 2018
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Chapter 2 research methods: safeguards against error. How we can be fooled: two modes of thinking. Second slow ad reflective, it takes mental effort: system 2 thinking, or analytical thinking . Although a test must be reliable to be valid, a reliable test can be completely invalid. Correlations can be positive, zero, or negative: a positive correlation means that as the value of one variable changes, the other goes in the same direction: if one goes up, the other goes up. A zero correlation means that the variables don"t go together at all. A negative correlation means that as the value of one variable changes, the other goes in the opposite direction: correlation coefficients range in value from -1. 0 to 1. 0. A correlation coefficient of -1. 0 is a perfect negative correlation, whereas a correlation coefficient of +1. 0 is a perfect positive correlation. Values lower than 1. 0 (either positive or negative), such as . 23 or . 69 indicate a less-than-perfect correlation coefficient.
