Question

Jenny wants to determine if a new brand name washing detergent is better than her old detergent. She washes ten dirty t-shirts with the new washing detergent. After washing, she thinks they are cleaner using the new detergent. What can she do to be sure the new washing detergent works better than the old detergent?

Answer 1

The independent varible is old and new and the dependent variable is 20 T-shirts.

Step-by-step explanation:

An independent variable is a variable whose value does not depend on any other factor. Whereas a dependent variable is a variable whose value depends on another factor.

Hence, in the given situation old and new detergent are independent variables as they do not depend on any other factor.

On the other hand, 20 dirty T-shirts are dependent variable because they get clean only if the detergent is strong enough.

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Answer 2

She could use a control to compare her data to and make sure it is cleaner. Ex. Use the old detergent on ten shirts and then use the new detergent on another ten shirts. She would then compare the shirts she did each detergent on and come up with her conclusion.