Test your knowledge: Interpret linear regression results
11. Which of the following are best practices when communicating linear regression results? Select all that apply.
- Provide measures of uncertainty around estimated results.
- Always extrapolate to a larger or different group any data insights that apply only to a specific, smaller population.
- Make the findings quickly understood without technical terms.
- Use data visualizations to present the results.
12. Which of the following statements accurately describe coefficients and p-values for regression model interpretation? Select all that apply.
- P-values determine how changes in the independent variables are associated with changes in the dependent variable.
- Coefficients demonstrate whether P-values are statistically significant.
- P-values demonstrate whether coefficients are statistically significant.
- Coefficients determine how changes in the independent variables are associated with changes in the dependent variable.
Weekly challenge 2
13. Fill in the blank: _____ is the difference between observed values and the predicted values of a regression line.
- Error
- Intercept
- Coefficient
- Residual
14. In linear regression, what mathematical technique is used to calculate beta zero hat and beta one hat?
- Ordinary least squares
- Mean squared error
- Coefficient of determination
- Coefficient R squared
15. A data professional testing for linear regression assumptions notices that their visualization of the data appears like a random cloud. Which model assumption does this invalidate?
- Homoscedasticity
- Independent observation
- Normality
- Linearity
16. FIll in the blank: A scatterplot _____ is a series of scatterplots that show the relationships between pairs of variables.
- progression
- succession
- array
- matrix
17. A data professional checking model assumptions notices the dependent variables appear in a cone-shaped pattern when plotting the residuals against the dependant variable. Which model assumption does this invalidate?
- Independent observation
- Normality
- Linearity
- Homoscedasticity
18. Fill in the blank: A confidence band is the area surrounding a line that describes the _____ around the predicted outcome at every value of X.
- certainty
- accuracy
- inaccuracy
- uncertainty
Shuffle Q/A 2
19. What is another term for R squared?
- Error of residuals
- Coefficient of residuals
- Residuals of determination
- Coefficient of determination
20. Which of the following statements accurately describe running a randomized, controlled experiment? Select all that apply.
- To be successful, data professionals must control for every factor in the experiment.
- It is a study design that randomly assigns participants into groups.
- It cannot have a control group.
- It is typically used when arguing for causation between variables.