2D-3A Review

Front

What is the population in a survey?

Back

The population is the entire group of individuals or instances about whom we hope to learn, such as 'Californians' in the context of a survey about the governor.

Front

What does a positive correlation between two variables indicate?

Back

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

Front

What does the slope of a regression line represent?

Back

The slope represents the expected change in the response variable for each one-unit increase in the explanatory variable.

Front

What is a residual in regression analysis?

Back

A residual is the difference between the observed value and the predicted value from a regression model.

Front

What does a residual plot show?

Back

A residual plot shows the residuals on the vertical axis and the independent variable on the horizontal axis, helping to assess the fit of a regression model.

Front

What indicates a good model in a residual plot?

Back

A good model is indicated by a random scatter of residuals without any clear patterns.

Front

What is an observational study?

Back

An observational study is a type of research where the researcher observes subjects without manipulating any variables.

Front

What is the least-squares regression line?

Back

The least-squares regression line is a line that minimizes the sum of the squares of the residuals, providing the best fit for the data.

Front

How do you interpret the coefficient of determination (r^2)?

Back

The coefficient of determination (r^2) indicates the proportion of variance in the dependent variable that can be explained by the independent variable.

Front

What does it mean if the r value is close to 1?

Back

If the r value is close to 1, it indicates a strong positive linear relationship between the two variables.