Scatterplots, Trend Lines, Correlation

Which of the following would be the most accurate equation for the scatter plot?

• y = -2x - 7

• y = -x + 7

• y = 3x + 7

• y = 25x + 7

What is the slope of this trend line?

• 70

• -3

Which line appears to fit the data better?

• line A

• line B

Which shows a line of best fit?

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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

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

What type of correlation?
The temperature outside and the amount of ice cream sales. 

• Positive correlation

• Negative correlation

• No correlation

Choose the scatter plot that best represents this relationship: The number of pets someone owns and the size of their shoes

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The scatterplot shows the temp, in degrees, outside a house every hour for 10 hours.

Estimate the temp after 13 hours based off the trendline.

• 57.5

• 50

• 10

• 13

• 61.5

Which scatter plot shows a linear relationship between x and y?

• Graph A

• Graph B

• Graph C

• Graph D