Numeracy in Science – Lines of best fit

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Presentation transcript:

Numeracy in Science – Lines of best fit Scatter graphs can be plotted to show the relationship between different things. This is a scatter graph showing how the length of spring varies with the mass hung from it. Which of the following sentences describes the relationship between the mass and length? A As the mass increases, the length decreases C As the mass decreases, the length increases B As the mass increases, the length increases D As the mass increases, the length doubles

Numeracy in Science – Lines of best fit Scatter graphs can be plotted to show the relationship between different things. A line of best fit is used to show the general trend. Which of these is NOT true about a line of best fit? A It should have roughly as many points above it as below it B It should always go through (0, 0) C It should go through as many of the points as possible D It should be either a straight line or a smooth curve

Numeracy in Science – Lines of best fit A line of best fit is used to show the general trend. Which of these is NOT a good line of best fit? A B C D

Numeracy in Science – Lines of best fit Sometimes you will have points on your scatter graph that look out of place – they don’t seem to fit into the general pattern. These are called outliers. Which of these points is an outlier? A B D C

Numeracy in Science – Lines of best fit This scatter graph has one or more outliers. Which of these would be the most accurate line of best fit? D A B C

Numeracy in Science – Lines of best fit - ANSWERS Scatter graphs can be plotted to show the relationship between different things. This is a scatter graph showing how the length of spring varies with the mass hung from it. Which of the following sentences describes the relationship between the mass and length? A As the mass increases, the length decreases C As the mass decreases, the length increases B As the mass increases, the length increases D As the mass increases, the length doubles

Numeracy in Science – Lines of best fit - ANSWERS Scatter graphs can be plotted to show the relationship between different things. A line of best fit is used to show the general trend. Which of these is NOT true about a line of best fit? A It should have roughly as many points above it as below it B It should always go through (0, 0) C It should go through as many of the points as possible D It should be either a straight line or a smooth curve

Numeracy in Science – Lines of best fit - ANSWERS A line of best fit is used to show the general trend. Which of these is NOT a good line of best fit? A B C D

Numeracy in Science – Lines of best fit - ANSWERS Sometimes you will have points on your scatter graph that look out of place – they don’t seem to fit into the general pattern. These are called outliers. Which of these points is an outlier? A C D B

Numeracy in Science – Lines of best fit - ANSWERS This scatter graph has one or more outliers. Which of these would be the most accurate line of best fit? A B D C