Question

a researcher at lumen university would like to test the impact of two teaching methods on students achievement in an introductory statistics course. the researcher selects subjects randomly from the population of students who enrolled in the introductory statistics course and assigned them to two blocks of four such that each student has the same undergraduate class standing (freshman, sophomore, junior, and senior). within each block, each student is randomly assigned to a different teaching method. at the end of the semester, the researcher collects the students final grade in the introductory statistics course.
what is the blocking variable?
lumen university
lumen university students who enrolled in the introductory statistics course
the introductory statistics course
the teaching methods
students undergraduate class standing
students final grade in the introductory statistics course

Explanation:

In an experiment, a blocking variable is used to group subjects with similar characteristics. Here, students are grouped into blocks based on their undergraduate class - standing (freshman, sophomore, junior, senior). This is done to control for the potential confounding effect of class - standing on the impact of teaching methods on students' achievement.

Answer:

Student's undergraduate class standing