Test Yourself

Correct: The dependent variable in a study is the outcome that we are trying to explain variation in.

The dependent variable in a study is the outcome that we are trying to explain variation in.

Correct: The independent variable is the variable that we manipulate in an experimental study or the exposure variable in an observational study. We are trying to understand what happens to our outcome or response if we change or manipulate the independent variable

Correct: The interest is in how having a cleft palette affects the psychological wellbeing of the child, so cleft is the exposure variable. It does not make any causal sense to look at this relationship in reverse by the very nature a cleft being a birth abnormality.

Correct: Gene expression is the outcome which was examined in several genes, so calcium condition is the independent variable.

Correct: The treatment has 2 levels, high or low and so is binary.

Correct: There were 6 replicates per gene, 3 under each level of calcium challenge.

Correct: Gene expression was measured in 3 genes.

Correct: There were 6 replicates, 3 in each condition.

Correct: In this example we are interested in seeing how gene affects expression and so gene is the exposure or independent variable.