problem-3.7

problem-3.7  The table is made with
> data(UScereal, package="MASS")
> attach(UScereal)
> table(shelf,mfr)
    
It appears that Q (Quaker Oats) is underrepresented on the shelf 1, and R (Ralston Purina) is overrepresented there. Shelf 1 is less likely to be seen by casual consumers, so it has less chance of encouraging impulse buying.