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Eighth Grade (Grade 8) Statistics and Probability Concepts Questions

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Grade 8 Scatter Plots CCSS: 8.SP.A.1
Which type of association is being represented by the data below?
x - 2, 1, 6, 6, 8, 9, 7
y - 1, 3, 4, 7, 7, 9, 8
  1. Constant association
  2. Positive association
  3. Negative association
  4. No association
Grade 8 Scatter Plots
The scatterplot represents what type of association?
Scatter Plot 1
  1. Positive Association
  2. Negative Assocation
  3. Constant Assocation
  4. Nonlinear Association
Grade 8 Scatter Plots CCSS: 8.SP.A.1
What type of association is represented from the information below?
x - 1, 2, 3, 4, 5, 6, 7
y - 2, 3, 4, 5, 6, 7, 8
  1. constant association
  2. positive linear association
  3. negative linear association
  4. no association
Grade 8 Scatter Plots
Which of the following best describes the points in this scatterplot?
Scatter Plot 2
  1. Increasing linear
  2. Decreasing linear
  3. Nonlinear
  4. None of these
Grade 8 Scatter Plots CCSS: 8.SP.A.2
What would be the slope of a line of best fit?
Scatter Plot 1
  1. 1
  2. 4
  3. 14
  4. 44
Grade 8 Scatter Plots CCSS: 8.SP.A.1
If a scatter plot has a line of best fit that decreases from left to right, which of the following terms best describes the association?
  1. Positive association
  2. Negative association
  3. Constant association
  4. Nonlinear association
Grade 8 Scatter Plots CCSS: 8.SP.A.2
Which of the equations below best represents the line with the following points?
x - 0, 1, 2, 3, 4
y - 10, 9, 8, 7, 6
  1. y=x+10
  2. y=-x-10
  3. y=x-10
  4. y=-x+10
Grade 8 Collecting and Interpreting Data CCSS: 8.SP.A.4
The weather was observed for 30 days. Each day was classified as sunny or cloudy, and also classified as windy or not windy. The results are shown below:
Sunny - 5 days windy, 15 days not windy
Cloudy - 4 windy, 6 not windy
Which of the following statements is NOT supported by the data?
  1. 25% of the sunny days were also windy.
  2. 29% of the not windy days were also cloudy.
  3. 40% of the cloudy days were also windy.
  4. 50% of the windy days were also sunny.
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