class_day <- c(1:10)
control_group <- c(67,72,69,81,73,66,71,72,77,71)
A_treatment_group <- c(NA,72,77,81,73,85,69,73,74,77)
B_treatment_group <- c(NA,66,68,69,67,72,73,75,79,77)
class.df<-data.frame(class_day, control_group, A_treatment_group, B_treatment_group)
I tried to convert vecotrs to a table but I am not sure how to include three categories in one plot.
How can I get a scatter plot with three different colors? I would like to set x-axis as class_day above and y axis as scores.

