What is the direction of the force for a negative charge moving downward in a magnetic field pointing to the left?

Olivia uses the work below to determine 55% of 720 which explains the error in olivia’s solution

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?

Aphrase is shown read the phrase and give me the answer