Help me please

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?

Kira looked through online census information to determine the overage number of people living in the homes in her city what is true about kira's data collection?

How many ordered pairs of positive integers satisfy xy=32?