If You Wanted to Test If Antibacterial Soap Worked Better

question 4

Multiple Choice

If you wanted to test if antibacterial soap worked better than regular soap, which experiment below has the strongest experimental design?

• A)Have people wash with antibacterial soap first and later with regular soap.
• B)Have two groups of people wash with either antibacterial or regular soap.
• C)Have two groups of people wash with either antibacterial or regular soap, without knowing which type of soap they are using.
• D)Have two groups of people wash with either antibacterial or regular soap, with neither the researchers nor the groups knowing which type of soap they are using.

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