Line of Best Fit and Correlations

Which line appears to fit the data better?

• line A

• line B

Do the following data show a positive correlation, negative correlation, or no correlation?

• positive correlation

• negative correlation

• no correlation

If two quantities A and B exhibit a positive correlation, then as quantity A decreases, quantity B would . . .?

• increase

• decrease

• stay the same

What type of correlation do the data here represent?

• positive

• negative

• no correlation

What type of correlation would you likely see with:

The amount of time students spent playing video games the night before a test compared to their respective grades on that test

• positive correlation

• negative correlation

• no correlation

The scatter plot below shows the average yearly consumption of bottled water by people in the United States starting in 1990.

Using the line of best fit, predict the average consumption of bottled water in the year 2000?

• 20 gallons

• 18 gallons

• 22 gallons

• 19 gallons

Determine the equation for the line of best fit using the given two points on the line of best fit, where x is the number years since 1992 and y is the number of clothes donated in thousands.

• y = -0.375x + 48.5

• y = 0.375x + 48.5

• y = -0.375x - 48.5

• y = 0.375x - 48.5

Determine the equation for the line of best fit

The graph shows the weights of dogs and the time it took the same dogs to complete an agility course in seconds.

Which shows the line of best fit for the data?

• 
• 
• 
• 

Which relationship is shown by the above scatterplot?

• As the cost goes down, the number sold goes down

• As the cost goes up, the number sold goes down

• As the cost goes down, the number sold remains the same

• There is no relationship between cost and the number sold