Scatterplots & Linear Regressions

What is a scatter plot?

• A graph that shows the relationship of two data sets

• A graph that shows information that is connected in some ways

• A graph drawn using rectangular bars to show how large each value is

• A graph that shows data changing over time

What type of correlation describes the following sentence : The temperature outside and the number of hot chocolate sold at football game

• Negative

• Horizontal

• Positive

• Non-linear

What would be the correlation between Mathematics grade and the time it takes to run a mile?

• Positive correlation

• Negative correlation

• no correlation

• cannot be determined

As the age of the car increases, its value decreases. Which scatter plot represents this relationship?

• 
• 
• 
• Cannot be determined

You are analyzing a scatter plot that has a negative correlation. What is true of the of the x and y values?

• As x increases, y decreases

• As x increases, y increases

• As x decreases, y decreases

• As x decreases, y increases

Describe The Correlation, if the correlation coefficient is r= -0,26

• positive, strong

• positive, weak

• negative, weak

• negative, strong

Estimate the correlation coefficient

• r = -1

• r = -.5

• r = - .8

• r = .8

As the age of the car increases, its value decreases. Which scatter plot represents this relationship?

• 
• 
• 
• 

Choose the letter of the scatter plot which could possibly have the given r value. r = 0.5

• 
• 
• 
• 
• 

r = 0.47. What is the strength of the correlation?

• strong

• weak

• moderate

• none