Martha believes a relaxation technique involving visualizationwill help people w

Martha believes a relaxation technique involving visualizationwill help people with mild insomnia fall asleep faster. Sherandomly selects a sample of 20 participants from a group of mildinsomnia patients and randomly assigns 10 to receive visualizationtherapy. The other 10 participants receive no treatment. Eachparticipant is then measured to see how long (in minutes) it takeshim or her to fall asleep. Given: