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Scatterplots and Correlations  Concept
Alissa Fong
Alissa Fong
MA, Stanford University
Teaching in the San Francisco Bay Area
Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts
Solving rational equations is substantially easier with like denominators. When solving rational equations, first multiply every term in the equation by the common denominator so the equation is "cleared" of fractions. Next, use an appropriate technique for solving for the variable.
Correlation is an important topic to get straight in your head because it shows up a lot in standardized tests and high school exit exams. But you guys it's not as hard as it sounds, correlation relates to slope if you know what slope is, it's the same idea. Correlation is also tied to trend lines or lines of best fit if that makes sense to you.
Let me show you what I'm talking about, correlation describes the relationship between two variables. So in this first graph, we have what's called a "positive correlation" because as one variable gets bigger the other variable also gets bigger. If you know about slopes you might see that's a positive slope line, easy. Next one same idea negative correlation it's like a negative slope as one variable gets larger like this guy gets larger, this one is getting smaller. As one of them gets larger the other one gets smaller that's called a negative correlation.
Lastly sometimes when we have what we call "no correlation" that's when the dots are just out there in a scattered plot with no real trend you can see. They're like randomly thrown out there. Sometimes variables are not correlated at all, things like how tall you are and what grades you get in school. Those things are totally unrelated to each other, because people who get good grades aren't always tall and people who are tall aren't always getting good grades. Does that make sense? I hope so anyway correlation has to do with how two variables are related to each other. Think of slope might be positive, negative or no correlation at all.
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Alissa Fong
M.A. in Secondary Mathematics, Stanford University
B.S., Stanford University
Alissa has a quirky sense of humor and a relatable personality that make it easy for students to pay attention and understand the material. She has all the math tips and tricks students are looking for.
Your tutorials are good and you have a personality as well. I hope you have more advanced college level stuff, because I like the way you teach.”
Thanks alot for such great lectures... I never found learning this easier ever before... keep up the great work.... :)”
You seem so kind, it's awesome. Easier to learn from people who seem to be rooting for ya!' thanks”
Concept (1)
Sample Problems (2)
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Scatterplots and Correlations
Problem 1 4,924 viewsDoes this graph represent a positive correlation, negative correlation, or no correlation?

Scatterplots and Correlations
Problem 2 4,082 viewsWhat kind of correlation would you expect between
a) age and hearing ability?b) a person's GPA and height?
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