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Chapters 8 thru 10-1

# Chapters 8 thru 10-1 - Chapter 8 Correlation/Linear...

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1 Chapter 8 Correlation/Linear Regression Linear Relationships: If the explanatory and response variables show a straight- line pattern, then we say they follow a linear relationship. Curved relationships and clusters are other forms to watch for.

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2 Chapter 8 Correlation/Linear Regression Linear Relationships: If the explanatory and response variables show a straight- line pattern, then we say they follow a linear relationship. Curved relationships and clusters are other forms to watch for.
3 Chapter 8 Correlation/Linear Regression Direction: If the relationship has a clear direction, we speak of either positive association or negative association. Positive association: high values of the two variables tend to occur together Negative association: high values of one variable tend to occur with low values of the other variable.

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4 Chapter 8 Correlation/Linear Regression Correlation is a number that determines the strength of a linear relationship between two quantitative variables. Correlation is always between -1 and 1 inclusive The sign of a correlation coefficient determines positive/negative association between the variables
5 Chapter 8 Correlation/Linear Regression Strong correlation: If r is between 0.8 and 1 and -0.8 and -1 Moderate correlation: If r is between 0.5 and 0.8 and -0.8 and -0.5 Weak correlation: If r is between 0 and 0.5 and -0.5 and 0

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6 Chapter 8 Correlation/Linear Regression Correlation does not distinguish between X and Y Correlation is unitless Correlation measures the strength of linear relationship between two quantitative variables
7 Chapter 8 Correlation/Linear Regression

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8 Choose the best description of the scatter plot A. Moderate, negative, linear association B. Strong, curved, association C. Moderate, positive, linear association D. Strong, negative, non-linear association E. Weak, positive, linear association
9 Which of the following values is most likely to represent the correlation coefficient for the data shown in this scatterplot? A. r = -0.67 B. r = -0.10 C. r = 0.71 D. r = 0.96 E. r = 1.00

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10 Which of the following values is most likely to represent the correlation coefficient for the data shown in this scatterplot? A. r = -0.67 B. r = -0.10 C. r = 0.71 D. r = 0.96 E. r = 1.00
Which of the following values is most likely to represent the correlation coefficient for the data shown in this scatterplot? A. r = -0.67

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Chapters 8 thru 10-1 - Chapter 8 Correlation/Linear...

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