Unit 2 Two Variable Statistics

Describe the correlation in the graph shown.

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

Tags

CCSS.HSF-LE.A.1B

What type of correlation does this graph show?

• Positive
• negative
• none
• all of the above

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CCSS.HSS.ID.B.6

CCSS.HSS.ID.C.8

The residual plots from five different least squares regression lines are shown below. Which of the plots shows the strongest evidence that its regression line is an appropriate model for the data and is consistent with the assumptions required for inference for regression?

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CCSS.HSS.ID.A.3

The computer output below shows the result of a linear regression analysis for predicting the concentration of zinc, in parts per million (ppm), from the concentration of lead, in ppm, found in fish from a certain river. Which of the following statements is a correct interpretation of the value 19.0 in the output?

• On average there is a predicted increase of 19.0 ppm in concentration of lead for every increase of 1 ppm in concentration of zinc found in the fish.

• On average there is a predicted increase of 19.0 ppm in concentration of zinc for every increase of 1 ppm in concentration of lead found in the fish.

• The predicted concentration of zinc is 19.0 ppm in fish with no concentration of lead.

• The predicted concentration of lead is 19.0 ppm in fish with no concentration of zinc.

• Approximately 19% of the variability in the zinc concentration is predicted by its linear relationship with lead concentration.

Tags

CCSS.HSF.LE.B.5

The following computer output describes the relationship between y = height (in cm) and x = foot length (also in cm) for 12 randomly selected students from the British Census @ Schools database. The scatterplot for this relationship show a roughly linear shape. Which of the following is an equation of least-squares regression line for these data?

• Height = 117.99 + 1.878 (Foot Length)
• Foot Length = 117.99 + 1.878 (Height)
• Height = 1.878 + 117.99 (Foot Length)
• Foot Length = 1.878 + 117.99 (Height)

Tags

CCSS.8.EE.C.8C

When the regression line is used to find a value outside of the data points, as shown in this graph, it is called...

• Convenience

• Correlation

• Interpolation

• Extrapolation

Tags

CCSS.8.SP.A.3

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

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CCSS.HSF.IF.B.4

CCSS.HSS.ID.B.6

CCSS.HSS.ID.C.7

Which of the following lines represents the line of best fit for the scatter plot?

• A
• B
• C
• D

Tags

CCSS.8.EE.B.5

Describe the association for the scatterplot based on data plotted.

• As the weeks increase, the amount of money on the gift card increases.

• As the weeks decrease, the amount of money on the gift card increases.

• There is no relationship between the time in weeks and the amount of dollars.

• As the weeks increase, the amount of money on the gift card decreases.

Tags

CCSS.HSS.ID.B.6

What does the y-intercept mean in the context of the data?

• At 0 years old there are no visits.

• At 3 years old there are 10 visits.

• At 6 years old there are 20 visits.

• At 12 years old there are 30 visits.

Tags

CCSS.HSF.LE.B.5