Amaya's test scores in algebra 1 are 78 and 91. she has one more test left and wants to earn a b for the course, which is from 80-89 inclusive. write a compound inequality to represent the situation.

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?