Renaissance-Lecture 3 Notes - Descriptive techniques o Bias...

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Descriptive techniques o Bias sampling in 1948 presidential election, “Dewey defeats Truman” in Chicago Daily Tribune; only rich people had phones for poll at the time. o People are notoriously inaccurate in predicting how they respond to a situation Can fix after identifying disadvantages…. Unanimous voting Correlational research o Examines relationship between two or more variables Smoking and lung cancer Are people who smoke more, more likely to get lung cancer? As long as I can measure it, I can correlate it; whenever it makes sense Data is only being collected, not manipulated o Measures of correlation Measures how strong relationship is between variables Correlation coefficient ® Range: Between +1 and -1 Direction: o positive indicates variables move in same direction o negative indicates variables move in opposite direction Strength: o closer to +1/-1, stronger the relationship o 0 correlation means no relationship between variables Positive correlation: small (about 0.10), moderate (about 0.30)
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