Unit 3 Essential Skills Practice

Which options below are a bivariable data set?

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What type of linear association does this scatterplot indicate?

• Strong negative

• Strong Positive

• Weak Positive

• Weak Negative

Which of the following best represents the linear association with Pearson's Correlation Coefficient r=1?

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Describe the correlation in the graph shown.

• Strong Negative
• Strong Positive
• Weak Negative
• Weak Positive

What is a best-fit line 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

What type of association does this graph show?

• Positive
• negative
• none
• all of the above

You are analyzing a scatter plot that has a negative correlation. What is true of the of the x and y values?

• As x increases, y decreases
• As x increases, y increases
• As x decreases, y decreases

Which of the following pairs of variables would be expected to have a negative association?

• GPA and height

• Number of chores and weekly allowance

• Number of hours spent studying and test grade

• Number of miles driven and amount of gas remaining in gas tank

• Age and IQ

What type of correlation does the plotted data show?

• positive correlation

• negative correlation

• no correlation

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

• Graph A
• Graph B
• Graph C
• Graph D