Suppose you deposit $2000 in a bank account that has a doubling time of 19yrs. To the nearest $100, what will your balance be after 5 yrs

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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?

Pranza plotted point a in the coordinate plane below.