A researcher is testing a company's new stain remover. He has contracted with 40 families who have agreed to test the product. He randomly assigns 20 families to the group that will use the new stain remover and 20 to the group that will use the company's current product. The most important reason for this random assignment is
a. randomization is a good way to create two groups of 20 families that are as similar as possible except for the treatments they receive
b. randomization makes the analysis easier since the data can be collected and entered into the computer in any order
c. randomization eliminates the impact of any confounding variables
d. randomization reduces the impact of outliers
e. randomization ensures that the study is double-blinded
Answer: randomization is a good way to create two groups of 20 families that are as similar as possible except for the treatments they receive
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