Correlation (Grade 12 NSC Matric Mathematics): Quizzes

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Correlation
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What is the range of values for the correlation coefficient rr?

−1≤r≤1-1 \leq r \leq 1

What does r=1r = 1 indicate?

Perfect positive correlation

What happens in a positive correlation?

Both variables increase together

A correlation coefficient of r=0.85r = 0.85 is classified as what strength?

Strong

In the formula r=b×σxσyr = b \times \frac{\sigma_x}{\sigma_y}, what does bb represent?

Gradient of regression line

Does correlation imply causation?

No, correlation does not imply causation

In negative correlation, how do data points slope on a scatter plot?

Downwards from left to right

What range indicates a weak correlation?

0.25≤∣r∣<0.50.25 \leq |r| < 0.5

What does the correlation coefficient measure?

Strength & direction of linear relationship

What correlation strength is indicated by 0.5≤∣r∣<0.750.5 \leq |r| < 0.75?

Moderate

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