Linear Correlation Flashcards

1
Q

When two quantities are strongly linked together, they have what type of correlation?

A

high correlation

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2
Q

How do we know if two quantities are strongly linked together?

A

if the data points in the scatter plot are either on the line of best fit or close to the best fit line

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3
Q

What is the degree of correlation quantified by?

A

the correlation coefficient (r)

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4
Q

What is the value range for the correlation coefficient (r)?

A

-1 ≤ r ≤ 1

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5
Q

What type of relationship is there if r > 0?

A

a positive (increasing) relationship

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6
Q

What type of relationship is there if r < 0?

A

a negative (decreasing) relationship

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7
Q

The closer the value is to 0…

A

the more scattered the data is

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8
Q

The closer the value is to 1 or -1…

A

the less scattered the data is

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9
Q

What is the value of r is the data points don’t show any trend?

A

r = 0

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