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# Lecture24 - GEM2900 Semester 1 2009/1010 GEM 2900...

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GEM2900 Semester 1, 2009/1010 NUS/FOS/DSAP 1 Lecture 24 Understanding Uncertainty & Statistical Thinking GEM 2900

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GEM2900 Semester 1, 2009/1010 NUS/FOS/DSAP 2 Relationship between Two Variables (Measurements) Natural variability exists in measurements of two variables under study. Statistical methods can be used to quantify the relationship between two measurement variables. Two commonly seen methods used… Correlation – measuring the strength of a linear relationship between two measurement variables Regression – predicting the value of one measurement variable from the knowing the value of the other one
GEM2900 Semester 1, 2009/1010 NUS/FOS/DSAP 3 Relationship between Two Variables (Measurements) Statistical relationships versus deterministic relationships… Deterministic relationship – The value of a variable can be determined if we know the value of the other variable (e.g.) 0 C = ( 0 F – 32)x5/9 Statistical relationship – The natural variability exits in both measurements. (e.g.) We could describe the relationship between height and weight for adult female. If we know the height of a woman, we could predict the average weight for women with that height, but not the exact height for that woman. Knowing value of one variable, statistical relationships can be useful for describing the aggregate of the other variable

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GEM2900 Semester 1, 2009/1010 NUS/FOS/DSAP 4 Relationship between Two Variables (Measurements) Statistical significance –
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Lecture24 - GEM2900 Semester 1 2009/1010 GEM 2900...

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