Pass rates for Intermediate Algebra at a community college are 52.6%. In an effort to improve pass rates in the course, faculty of a community college develop a mastery based learning model where course content is delivered in a lab through a computer program. The instructor serves as a learning mentor for the students. Of the 480 students who enroll in the mastery-based course, 267 pass.

(a) What is the variable of interest in this study? What type of variable is it?

(b) At the 0.01 level of significance, decide whether the sample evidence suggests the mastery-

based learning model improved pass rates.