# MATH 124 UCLA Scatterplots & Product Moment Correlation Exam Practice

I’m trying to study for my Statistics course and I need some help to understand this question.

A correlation, whether product-moment or rank order, has to be between:

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If you have two measurement variables you want to correlate and one is badly skewed, you most likely want to take:

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Based on the scatterplot and statistics above, what is the nature of the correlation between eye fatigue and sleep?

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If I were trying to guess someone’s sleep quality and didn’t know anything about the person, I would just guess the mean sleep quality score. After all, the mean is the “central” figure and is a good measure of what is typical. But if I know the person’s eye fatigue score, it helps me guess their sleep quality. How much does it help?

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### Question 5

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#### Question text

When eye fatigue increases by 1 unit, sleep quality tends to:

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