Lesson L2-28
L2-28 Draw and interpret scatter diagrams and recognise positive and negative correlation Quiz: Pearson Edexcel Functional Skills Maths, Unit 2
20 questions
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Lesson L2-28, Draw and interpret scatter diagrams and recognise positive and negative correlation: 20 multiple choice questions for the Pearson Edexcel Functional Skills Maths (Functional Skills Mathematics L1/L2), Unit 2: Level 2 content, written with Revision Ninja.
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The 20 questions
-
What term describes when two variables both increase together on a scatter diagram?
- Positive correlation
- Negative correlation
- Inverse proportion
- No correlation
-
What does negative correlation mean on a scatter diagram?
- One increases, one decreases
- Both variables decrease
- Both variables increase
- No relationship exists
-
What appearance does no correlation have on a scatter diagram?
- Clustered corners
- Upward straight line
- Downward curve
- Random scattered points
-
Which variable is conventionally plotted on the horizontal axis?
- Response variable
- Independent variable
- Dependent variable
- Outcome variable
-
What is the primary purpose of a line of best fit?
- Estimating values
- Connecting every point
- Measuring exact error
- Proving causation
-
When points lie close to a straight line, the correlation is described as?
- Weak
- Reversed
- Zero
- Strong
-
What does correlation between two variables actually prove?
- Guaranteed causation
- Direct causation
- Exact causation
- Not causation
-
What does each individual plotted point on a scatter diagram represent?
- Single total sum
- Range boundary
- Mean of the data
- Pair of linked values
-
Hours of revision and test marks rise together across students. What correlation is shown?
- No correlation
- Negative
- Positive
- Perfect positive
-
Daily temperature rises while hot-drink sales fall. What correlation is shown?
- No correlation
- Perfect positive
- Negative
- Positive
-
Shoe size is plotted against exam marks and the points are scattered. What correlation is shown?
- Positive
- Perfect positive
- No correlation
- Negative
-
A line of best fit passes through (0, 5) and (10, 25). What is its gradient?
- 20
- 5
- 0.5
- 2
-
A line of best fit is y = 3x + 2. Estimate y when x = 5.
- 13
- 17
- 21
- 15
-
What links two unrelated variables that rise and fall together?
- Random chance
- Direct causation
- Data error
- A third factor
-
A scatter diagram has points lying close to a downward sloping straight line. Which correlation is this?
- Strong negative
- No correlation
- Weak positive
- Strong positive
-
A line of best fit has a gradient of -2. What does this indicate?
- Negative correlation
- Positive correlation
- Perfect correlation
- Zero correlation
-
A line of best fit is y = 0.5x + 10. What is x when y = 30?
- 40
- 60
- 20
- 80
-
Ten points rise steadily, while two points sit far below. What are those two points?
- Intersects
- Outliers
- Gradients
- Averages
-
Using a line of best fit to estimate values beyond the range of the data is called what?
- Causation
- Extrapolation
- Correlation
- Interpolation
-
The points (1, 8), (2, 6), (3, 5), (4, 2) are plotted. What is the correlation?
- Zero
- Negative
- Perfect
- Positive
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