Advanced Placement (AP), 04.09.2020 21:01, thruhdyjgrt

Dr. Patel is conducting a study to test a hair-growth shampoo she is developing. She instructs fifty participants to use the hair-growth shampoo once daily for a month and another fifty to use a regular shampoo once a day for a month. Dr.
Patel measures the participants' hair length at the beginning and the end of the thirty days. Which of the following is
the dependent variable?

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Dr. Patel is conducting a study to test a hair-growth shampoo she is developing. She instructs fifty...