Statistics Scatterplots

Estimate the correlation coefficient for this scatterplot.

• r = -0.9

• r = 1

• r = 0.9

• r = -1

Students in a science class investigated how the speed of changes with the air temperature outside. The data is shown in the scatterplot. Based on the scatterplot, what is the best prediction of the speed of sound when the air temperate is 50 degrees C?

• 350 m/s

• 362 m/s

• 358 m/s

• 348 m/s

Based on the scatterplot, what is the best prediction of the resting heart rate of a person who exercises an average of 8 hours each week?

• 30 beats per minute

• 50 beats per minute

• 40 beats per minute

• 60 beats per minute

Interpret the slope of the Least Squares Line Equation.

• Income increases by 31.45 with each additional 2 hours worked.

• Income increases by 31.45

• As hours increases by one, income will increase by 31.45.

• As hours increases by one, income will decrease by 242.3.

In a strong relationship between two variables in a scatterplot, the data closely follows a _______.

• Line

• Pattern

• Constant

Which of the following scatterplots show no association?

Select all that apply

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What should a proper scatterplot have? Select All that Apply

• Title

• Axis labeled with explanatory and response variable with units

• Scale of graph

A strong positive correlation has a r close to_____

• 0.93

• 0.49

• -1

• 0

When r^2 is closer to 1, the relationshp between two varables is

• Stronger

• Weaker

Which of the following scatterplots show clusters?

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