Martin bought his mom chocolate truffles for Mother's Day. She likes a mix of chocolates, but dark chocolate is her favorite. Martin decided to get 12 fewer milk chocolate truffles than dark chocolate truffles. Martin got d dark chocolate truffles and 6 milk chocolate truffles

Simplify the expression. enter the correct answer.

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Researchers were interested in whether relaxation training decreases the number of headaches a person experiences. they randomly assigned 20 participants to a control group or a relaxation training group and noted the change in number of headaches each group reported from the week before training to the week after training. which statistical analysis should be performed to answer the researchers' question?