Bivariate Statistics Flashcards
Why do you have to take note of the saved function f when doing a linear regression?
So you can use the saved function later to predict outputs.
You click the var button in a calculator tab and choose the correct function.
What would a scatter plot look like if r = 1 ?
What would a scatter plot look like if r = 0.9 ?
What does this symbol represent?
Pronounced “x bar”, this symbol represents the mean for the variable x.
What is the fancy calculator name for “line of best fit “ ?
Linear Regression (mx+b)
What does it mean if r = 0 ?
There is no correlation between the two variables.
What are the lowest and greatest values r can be?
The lowest r can be is -1.
The greatest r can be is +1.
What would a scatter plot look like if r = 0 ?
What does b stand for in the equation for a straight line?
y = mx + b
b is the y-intercept
What does it mean if r = 1 ?
The two variables are perfectly positively correlated.
What would a scatter plot look like if r = -0.5 ?
What is the equation for the regression line (aka any straight line)?
What would a scatter plot look like if r = 0.5 ?
What are the many names we use for correlation?
All of these names refer to the same thing.
- Pearson correlation coefficient
- Pearson product-moment correlation coefficient
- Pearson’s r
- bivariate correlation
What would a scatter plot look like if r = -1 ?
What does this symbol represent?
Pronounced “y bar”, this symbol represents the mean for the variable y.
What does m stand for in the linear regression line?
y = mx + b
m is the gradient
What would a scatter plot look like if r = -0.9 ?
Where do I find b, the y-intercept of the linear regression line in the calculator output?
Where do I find m, the gradient of the linear regression line, in the calculator output?
