This is the graph of y=x^2+2x-2 what is the range of this function

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?

Which of the following statements is a true conclusion that can be made from the scaled bargraph?

Aiko jumped rope for 20 min and stopped at 8: 05 when did she start