Question

1. Sara wants to see if a new brand of hair dye lasts longer than the brand she

currently uses. She puts the new hair dye on the left side of her head and the old
brand on her right side. After 2 weeks she observes which side of her head has
more gray hair showing through.

Answer 1

1. Sara wants to see if a new brand of hair dye lasts longer than the brand she

currently uses. She puts the new hair dye on the left side of her head and the old

brand on her right side. After 2 weeks she observes which side of her head has

more gray hair showing through.