Marking brainliest!

Please help me with the last question

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?

See attachment below and find the equivalent of tan(∠qsr)

Given: ab ≅ bc and ao ≅ oc ok − angle bisector of ∠boc find: m∠aok