Scatterplots and Trend Lines Equations

Which two equations is a reasonable estimate for the trend line pictured?

Which graph best shows a positive correlation between the number of hours studied and the test scores?

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This scatterplot could show the relationship between which two variables?

• speed of an airplane (x) vs. distance traveled (y)

• outside air temperature (x) vs. air conditioning costs (y)

• age of an adult (x) vs. height of an adult (y)

• distance traveled (x) vs. gas remaining in the tank (y)

Which graph shows a line of best fit for the scatterplot?

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

• A

• B

• C

• D

Which graph has no association?

• A

• B

• C

• D

If m = -3/4 and b = 9, what is the equation of the trend line in y= mx + b?

• 0 = -3/4 (9) +9

• y = -3/4 x + 9

• y = -3/4 x - 9

• y = 3/4 + 9

Which of the following could be the equation of the trend line for this graph?

• There is no trend line because there is no association

Which line appears to fit the data better?

• line A

• line B

If m = 8/5 and b = -8/5, what is the equation of the trend line in y= mx + b?

• 0 = 8/5 (1) - 8/5

• y = -8/5 x + 8/5

• y = 8/5 x - 8/5

• y = mx + b