Outliers/Lev/Inf

Front

What is an outlier in a dataset?

Back

An outlier is a data point that differs significantly from other observations in a dataset, often due to variability in the measurement or it may indicate a measurement error.

Front

How does removing an outlier affect correlation?

Back

Removing an outlier can significantly change the correlation coefficient, as it may either strengthen or weaken the relationship between the variables.

Front

What is correlation in statistics?

Back

Correlation is a statistical measure that describes the extent to which two variables change together, indicating the strength and direction of their relationship.

Front

What is the slope in a linear regression?

Back

The slope represents the rate of change of the dependent variable for each unit change in the independent variable.

Front

What is the y-intercept in a linear equation?

Back

The y-intercept is the value of the dependent variable when the independent variable is zero, representing the point where the line crosses the y-axis.

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

How can outliers affect the slope of a regression line?

Back

Outliers can skew the slope of the regression line, making it steeper or shallower than it would be without the outlier.

Front

What is the purpose of analyzing correlation?

Back

Analyzing correlation helps to determine whether and how strongly pairs of variables are related, which can inform predictions and decisions.

Front

What does a correlation coefficient of 1 indicate?

Back

A correlation coefficient of 1 indicates a perfect positive linear relationship between two variables.

Front

What does a correlation coefficient of -1 indicate?

Back

A correlation coefficient of -1 indicates a perfect negative linear relationship between two variables.