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Lesson: Working with Scatter Plots and Lines of Best Fit

In this lesson, we learn how to represent data using scatter plots and how to transform these plots into lines of best fit which pass through the center of the group of data points.

Video: Calculating and Interpreting the Equation of a Line of Best Fit from a Scatterplot

Worksheet: Working with Scatter Plots and Lines of Best Fit • 9 Questions

Q1:

The scattergraph shows the body mass, measured in kilograms, against the average brain mass, measured in grams, for 15 species of mammals.

Give the approximate brain mass of the point that is most likely to represent an outlier.

A g
B 700 g
C 520 g
D 50 g
E 450 g

Which species of mammals do you think this point is most likely to represent?

Ahuman
Belephant
Ccow
Dchimpanzee
Ehorse

Q2:

The scattergraph shows the average gestation period, measured in days, against the average brain mass of an adult, measured in grams, for 13 species of mammals.

What type of correlation appears to exist between the gestation period and the brain mass?

Aa negative linear correlation
Ba positive linear correlation

What is the correct interpretation of this relationship?

AIn general, as the gestation period increases, so too does the brain mass.
BIn general, as the gestation period increases, the brain mass decreases.
CA greater brain mass leads to a longer gestation period.
DIn general, as the gestation period decreases, the brain mass increases.

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