Lesson 2e.02
2e.02 Describe and make comparisons of correlation by inspection: strong or weak Quiz: Pearson Edexcel Statistics, Unit 2
20 questions
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Lesson 2e.02, Describe and make comparisons of correlation by inspection: strong or weak: 20 multiple choice questions for the Pearson Edexcel GCSE Statistics (1ST0), Unit 2: Processing, representing and analysing data, written with Revision Ninja.
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The 20 questions
-
Points tightly clustered around a line show what?
- A random pattern
- Zero correlation
- Strong correlation
- Weak correlation
-
Points widely scattered around a trend show what?
- Causation
- Perfect correlation
- Strong correlation
- Weak correlation
-
Which pattern describes a strong negative correlation?
- Random scatter
- Tight downward clustering
- Tight upward clustering
- Wide downward spread
-
Scatter A has points tightly along an upward line. Scatter B has points loosely spread upward. Which has the stronger correlation?
- Cannot tell
- They are equal
- A
- B
-
Which correlation has points positioned closer to the trend line?
- Weak correlation
- Zero correlation
- Negative correlation
- Strong correlation
-
What feature is used to judge correlation strength by inspection?
- Point closeness
- Point colour
- Axis labels
- Sample size
-
Points show a rising trend but are fairly spread out. Which descriptor fits best?
- Strong positive correlation
- Weak positive correlation
- Zero correlation
- Strong negative correlation
-
Points lie exactly on a straight line. This is described as what?
- Causation
- Perfect correlation
- No correlation
- Weak correlation
-
What does a strong correlation allow you to do effectively?
- Predict values well
- Draw curved lines
- Ignore outliers
- Prove causation
-
What does a weak correlation indicate about predictions?
- Zero association
- Limited predictive help
- Absolute causation
- Perfect predictions
-
In visual inspection, what indicates a stronger correlation?
- More outliers
- Wider point spread
- Steeper intercept
- Closer point clustering
-
A steep downward trend with a few scattered points is best described as what?
- Zero correlation
- Weak positive correlation
- Strong negative correlation
- Non-linear correlation
-
Which visual feature is NOT used to judge correlation strength?
- Point clustering
- Scatter spread
- Point colour
- Overall trend
-
Which correlation coefficient indicates the strongest relationship?
- +0.80
- -0.95
- 0.00
- +0.10
-
What type of correlation is shown by an upward pattern on a scatter diagram?
- Spurious correlation
- Positive correlation
- Zero correlation
- Negative correlation
-
Which scatter diagram pattern indicates the strongest correlation?
- Widely scattered points
- Horizontal flat line
- Random circular spread
- Tightly grouped points
-
A correlation is weak in strength and negative in direction. How should it be described fully?
- Zero correlation
- Strong positive correlation
- Weak negative correlation
- Perfect negative correlation
-
What does a horizontal line of best fit on a scatter diagram indicate?
- Strong positive
- Strong negative
- Perfect causation
- Zero correlation
-
Two scatter diagrams have the same slope. In diagram 1 the points lie close to the line; in diagram 2 they are more spread. Which has the stronger correlation?
- Cannot tell
- Diagram 1
- They are equal
- Diagram 2
-
How should data points widely spread with no visible trend be described?
- Zero correlation
- Perfect correlation
- Strong positive
- Strong negative
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