Scatterplots and correlation coefficient

Scatterplots and correlation coefficient

Assessment

Flashcard

Mathematics

9th Grade

Practice Problem

Hard

Created by

Wayground Content

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15 questions

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1.

FLASHCARD QUESTION

Front

What is a scatterplot?

Back

A scatterplot is a graphical representation of two variables, showing the relationship between them using points on a Cartesian plane.

2.

FLASHCARD QUESTION

Front

What does the correlation coefficient (r) indicate?

Back

The correlation coefficient (r) measures the strength and direction of a linear relationship between two variables, ranging from -1 to 1.

3.

FLASHCARD QUESTION

Front

What does an r value of -0.98 indicate about the correlation?

Back

An r value of -0.98 indicates a strong negative correlation, meaning as one variable increases, the other decreases significantly.

4.

FLASHCARD QUESTION

Front

What does an r value of 0.5 indicate about the correlation?

Back

An r value of 0.5 indicates a moderate positive correlation, meaning as one variable increases, the other tends to increase as well.

5.

FLASHCARD QUESTION

Front

What does an r value of 0 indicate?

Back

An r value of 0 indicates no correlation between the two variables, meaning there is no predictable relationship.

6.

FLASHCARD QUESTION

Front

How do you interpret a weak negative correlation?

Back

A weak negative correlation (e.g., r = -0.26) suggests that there is a slight tendency for one variable to decrease as the other increases, but the relationship is not strong.

7.

FLASHCARD QUESTION

Front

If y varies directly as x, what is the relationship between y and x?

Back

If y varies directly as x, it means that y = kx for some constant k, indicating that y increases or decreases proportionally with x.

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