DA0-002 Data Analysis Practice Question
Which TWO of the following are true about Pearson correlation coefficient (r)?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
It measures the strength and direction of a linear relationship
Pearson r ranges from -1 to 1, measuring linear relationship; +1 indicates perfect positive linear correlation.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
An r of 0 means no relationship exists
Why it's wrong here
r=0 means no linear relationship, but other relationships may exist.
- ✗
It ranges from 0 to 1
Why it's wrong here
Ranges from -1 to 1.
- ✓
It measures the strength and direction of a linear relationship
Why this is correct
Correct.
- ✓
A value of +1 indicates a perfect positive linear relationship
Why this is correct
Correct.
- ✗
It can be used for categorical variables
Why it's wrong here
Pearson is for continuous variables.
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