Grogain and follicleplus are hair regrowth systems. each company claims that the application of their product will cause hair regrowth for balding men. a barber decided to test each company's claim. he randomly selected 30 of his customers who had similar balding issues and asked 15 of them to use grogain and 15 of them to use follicleplus. after observing the men for six months, the barber reported that, on average, those who used grogain had a 20% increase in hair regrowth and those who used follicleplus had a 10% increase in hair regrowth. what conclusion can be made form this observation?