Dr Pamela Sullivan claims that her new toothpaste whitens te

Dr. Pamela Sullivan claims that her new toothpaste whitens teeth five times faster than other toothpastes. How would you design a controlled experiment to test Dr. Sullivan’s hypothesis?

Solution

We will give a person a normal toothpaste and other person Dr. Pamella Sullivan\'s toothpaste and we will observe both the persons for few days and will obtain the results.Then we will able to decide whether the hypothesis of Dr.Sullivan\'s hypothesis is true or not.