Strength of Correlations

Describe the strength and direction of the trend

• Moderate Negative Trend

• Strong Negative Trend

• Moderate Positive Trend

• Strong Positive Trend

Describe the strength and direction of the trend

• Weak Negative Trend

• Strong Negative Trend

• Weak Positive Trend

• Strong Positive Trend

Describe the strength and direction of the trend

• Moderate Negative Trend

• Strong Negative Trend

• Moderate Positive Trend

• Strong Positive Trend

Describe the strength and direction of the trend

• Moderate Negative Trend

• Strong Negative Trend

• Moderate Positive Trend

• Strong Positive Trend

Describe the strength and direction of the trend

• Weak Negative Trend

• Strong Negative Trend

• Weak Positive Trend

• Strong Positive Trend

Estimate the correlation coefficient for this scatterplot.

• r = -0.9

• r = 1

• r = 0.9

• r = -1

Estimate the correlation coefficient

• r = 1

• r = -1

• r ≈ -0.8

• r ≈ 0.8

• r ≈ -0.5

Estimate the correlation coefficient for this scatterplot.

• r = 1.2

• r = 0.89

• r = 0

• r = -0.89

Which scatter plot diagram shows the strongest positive correlation?

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The scatter plot shows the number coffee shops in different cities and the number of violent crimes. Which of the following is NOT true?

• A) As the number of coffee shops increase, violent crimes appears to increase.

• B) The line of best fit (regression line) shows a positive correlation

• C) The data has a positive correlation coefficient

• D) An increase in coffee shops causes an increase in violent crimes