A researcher forms three blocks of students interested in taking a history course. The groups are based on grade point average (GPA). The first group consists of students with a GPA less than 2.5, the second group consists of students with a GPA between 2.5 and 3.1, and the last group consists of students with a GPA greater than 3.1. History courses are taught in three ways: traditional lecture, small-group collaborative method, and independent study. The researcher randomly assigns 10 students from each block to sections of history taught each of the three ways. Sections for each teaching style then have 10 students from each block. The researcher records the scores on a common course ­final examination administered to each student. Draw a flow chart showing the design of this experiment. Does the design ­t the model for randomized block design?