Good day Steve
In 2000 I created my on flipped an open enrollment evening college statistics class using a free online programed statistics textbook plus unique excel statistics software for homework. The top 20% (about 5 students) learned much more with less work and spent much less time in class/lab. The middle 60% had much less math anxiety, learned something but not enough to be useful. The bottom 20 finished with probably did something for their self-esteem.