Scatter Plots and Predictions

The scatterplot shows the age and the maximum vertical leap for six girls.

Based on this scatterplot, approximate the height of the vertical leap of a 10-year old girl.

• 12 inches

• 8 inches

• 8 years

• 12 years

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8.5.D

The graph shows how the number of inches of rain impacts the growth of a plant in inches. Based on the scatterplot, what is the best prediction of the number of inches a plant will grow after 4 inches of rain?

• A plant is expected to grow 0.8 inches after 4 inches of rain.

• A plant is expected to grow 0.2 inches after 4 inches of rain.

• A plant is expected to grow 1.5 inches after 4 inches of rain.

• A plant is expected to grow 1 inch after 4 inches of rain.

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8.5.D

What is a line of best fit used for?

• To make predictions

• To make the graph look pretty

• To connect the points

• To make it look like you know what you are doing

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8.5.D

Is this line an accurate line estimate of best fit for the data?

• Yes

• No

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8.5.D

The scatterplot shows the cost, in dollars, of five different ladders. Each ladder is a different length.

Based on this scatterplot, use a trend line to predict the cost of a 6 foot ladder.​ ​ (a)  

• $65

• $40

• $75

• $45

• $50

Tags

8.5.D

Which of the following could be a possible line of best fit for the data?

• y = -5/2x + 20

• y = -x + 19

• y = x + 20

• y = 2/3x + 15 

What type of association does this graph have?

• positive 

• negative

• none

• all of the above

The scatter plot shows the relationship between the number of chapters and the total number of pages for several books.  Use the trend line to predict how many chapters would be in a book with 180 pages. 

• 12 chapters

• 15 chapters

• 18 chapters

• 21 chapters

Find the equation of the line of best fit for the given data

• y=163.41x + 4.19

• y=-163.41x + 4.19

• y=-4.19x + 163.41

• y= 4.19x - 163.41
  

What is a trend line that shows the most accurate relationship between x and y and is is very close to most of the data points?

• linear regression

• no correlation

• trend line

• line of best fit