Question

1. a school nutritionist wants to study whether the type of breakfast affects students attention in morning classes. she records whether students eat cereal, toast, or no breakfast and then measures their attention scores during the first class. which of the following is the explanatory variable in this study?

options:

• students attention scores
• type of breakfast
• number of students in each breakfast group
• the time of the first class

Explanation:

An explanatory variable is the factor that is hypothesized to influence another variable (the response variable). Here, the nutritionist tests if breakfast type affects attention scores, so breakfast type is the explanatory variable.

Answer:

B. Type of breakfast