Researchers conducted an experiment to determine if riding a bike to school improves attention span. What are the treatment and outcome variables? a. The treatment variable is attention span. The outcome variable is the child's attention span score.
b. The treatment variable is riding a bike to school. The outcome variable is the child's attention span.
c. The treatment variable is attention span. The outcome variable is whether or not the child rode a bike to school.
d. The treatment variable is riding a bike to school. The outcome variable is whether or not the child rode a bike to school.

The correct option is (b). The treatment variable is riding a bike to school. The outcome variable is the child's attention span.

Step-by-step explanation:

Consider the provided information.

Independent Variable (Treatment Variable): The variable which can be manipulated or changed by researchers, not by other variables in the experiment.

So here riding a bike to school is the Treatment variable because this can be manipulated by ht e researchers.

Outcome variables: The outcome variables are dependent on the independent variables.

Here, attention span is depending on the treatment variable.

Therefore, the correct option is (b). The treatment variable is riding a bike to school. The outcome variable is the child's attention span.