Can someone help me with this. Will Mark brainliest. Need answer and explanation/work. Thank you!

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?

Me complete this proof! prove that a quadrilateral is a square. me with the steps for this proof.

What numbers are included in the set of integers? what numbers are not included?