Scatterplots Day 2 (Lin Reg)

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.

Front

What does a positive correlation indicate in a scatterplot?

Back

A positive correlation indicates that as one variable increases, the other variable also tends to increase.

Front

What does a negative correlation indicate in a scatterplot?

Back

A negative correlation indicates that as one variable increases, the other variable tends to decrease.

Front

What does no correlation mean in a scatterplot?

Back

No correlation means there is no discernible relationship between the two variables; changes in one do not affect the other.

Front

What is the correlation coefficient?

Back

The correlation coefficient is a numerical measure of the strength and direction of a linear relationship between two variables, ranging from -1 to 1.

Front

What does a correlation coefficient of 0.92 indicate?

Back

A correlation coefficient of 0.92 indicates a strong positive correlation between the two variables.

Front

What is the formula for linear regression?

Back

Front

How do you interpret the slope in a linear regression equation?

Back

The slope indicates the rate of change of the dependent variable (y) for each unit change in the independent variable (x).

Front

What is the y-intercept in a linear regression equation?

Back

The y-intercept is the value of y when x is 0; it represents the starting point of the line on the y-axis.

Front

What is the purpose of using a scatterplot?

Back

A scatterplot is used to visually assess the relationship between two quantitative variables and to identify trends, patterns, or outliers.