Unit02_Mod06_Correlation - PsychSim 5 Correlation 17 PsychSim 5 CORRELATION Name Section Date This activity demonstrates the use of scatterplots to

# Unit02_Mod06_Correlation - PsychSim 5 Correlation 17...

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Unformatted text preview: PsychSim 5: Correlation 17 PsychSim 5: CORRELATION Name: __________________________________________ Section: ________________________ Date: __________________________________________ This activity demonstrates the use of scatterplots to visualize positive and negative relationships. Positive Correlation • What does it mean to say that two variables are positively correlated? Positive correlation is a relationship between two variables in which both variables move in the same direction. Negative Correlation • What does it mean to say that two variables are negatively correlated? Negative correlation is a relationship between two variables in which one variable increases as the other decreases, and vice versa. Uncorrelated Variables • What does it mean to say that two variables are uncorrelated? Uncorrelated variables happen when the results are equally likely to have low or high values. Correlation Coefficient • What is a correlation coefficient? A number between −1 and +1 calculated so as to represent the linear dependence of two variables or sets of data. Why Use It? • What value or benefit would a researcher gain by calculating a correlation coefficient rather than simply describing the relationship as a positive correlation or a negative correlation? It would help that researcher in making more accurate predictions in newer studies. Estimating the Relationship • Look at the scatterplots and try to estimate the direction (positive or negative) and the strength of the relationship. Write in your guess below. o Scatterplot 1 Positive _______+0.9 o Positive +0.2 Scatterplot 4 _______ o Negative -0.9 Scatterplot 2 _______ o Scatterplot 5 _______ Uncorrelated 0 o Uncorrelated 0 Scatterplot 3 _______ o Positive +0.8 Scatterplot 6 _______ Causality and Predictability • The presence of a correlation between two variables doesn’t prove that certain values on one variequal able ________________ high or low values on the other. It merely demonstrates that the two varirelated ables are _____________________ in some way. a correlation coefficient • The relationship between two correlated variables has __________________________________. This means that if a strong correlation exists between variables, then knowing a person’s score on one variable allows us to predict a person’s score on the other variable. ...
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• Fall '17
• LUL
• Correlation, Correlation and dependence, Pearson product-moment correlation coefficient, Covariance and correlation, Spearman's rank correlation coefficient