Choose the appropriate test of significance for each of the following scenarios state the null and alternative hyporthesis and the appropriate test of signicance

6. A dentist randomly assigns 40 of his patients to two groups of 20 each. He uses hypnotism on one group and chemical anesthetic on the other. Each patient rates the amount of pain on a scale. He compares average rating for the two groups. 7. Tai Chi has been claimed to help people with lower back problems. You randomly select a group of people who have had persistent problems and you measure their flexibility with the Lower Back Flexibility test. After 6 months of intensive Tai Chi, you reassess their flexibility to see if Tai Chi has improved lower back flexibility. 8. A psychologist is interested in teaching kids through modeling. She decides to randomly select 20 sets of twins. She arbitrarily puts one twin in her control group and the other twin in her experimental groups. She splits up all twenty pairs in this way. The control group receives standard instruction and the experimental group also watches the task modeled by a child. Both groups are then tested on average amount of material learned. 9. Dr. Steffler is investigating whether spatial information or textual information organized hierarchically is more effective when searching the internet for information. She is also interested in implicit and explicit learning tasks. She gives the students a multiple choice test following the internet search task. What statistical test should she use to analyze her data? 10. Gary thinks hockey players do better if they have 2-3 days break between games rather than 1 week or more. He is also interested in whether the team does better at home games or away games. He measures the total number of games won in each condition. What statistical test should he use