Chapter 22 Week 4 - Formative test

A formative test helps you assess your progress in the course, and helps you address any blind spots in your understanding of the material. If you get a question wrong, you will receive a hint on how to improve your understanding of the material.

Complete the formative test ideally after you’ve seen the lecture, but before the lecture meeting in which we can discuss any topics that need more attention.

Question 1: When interested in causal relationships, experimental research is preferred over correlational research.

FALSE

TRUE

Question 2: Random assignment in an experimental design ensures that two groups will be equal on all covariates

FALSE

TRUE

Question 3: If the regression lines between a covariate and the outcome are not parallel for two groups in ANCOVA then…

…there must be an interaction between the grouping variable and covariate

…the data cannot have come from a random sample.

…the grouping variable and covariate must be correlated.

…the effect must be nonlinear.

Question 4: Nonspuriousness means that…

a relationship is not due to random chance

a relationship generalizes to new samples

a relationship holds even if the influences of other variables are eliminated

a relationship is causal in nature

Question 5: When comparing males and females using a regression model, the correct equation is: \(y_i = b_0 + b_1*Male_i + b_2*Female_i + e_i\)

TRUE

FALSE

Question 6: Adding covariates in ANCOVA can…

…decrease power to detect an effect by increasing the total sum of squares

…increase power to detect an effect by reducing the residual sum of squares

…increase power to detect an effect by increasing the model sum of squares

…decrease power to detect an effect by increasing the residual sum of squares

Question 7: If two groups differ on the covariate in an ANCOVA, we say there is an interaction.

FALSE

TRUE