EXTRA CREDIT

EXTRA CREDIT

Martha believes a relaxation technique involving visualization will help people with mild insomnia fall asleep faster. She randomly selects a sample of 20 participants from a group of mild insomnia patients and randomly assigns 10 to receive visualization therapy. The other 10 participants receive no treatment. Each participant is then measured to see how long (in minutes) it takes him or her to fall asleep. Given:
Before Treatment (X1) 22, 18, 27, 20, 23, 26, 27, 22, 24, 22 After Treatment (X2) 19, 17, 24, 21, 27, 21, 23, 18, 19, 22
Should she use an independent samples t-test or a related samples t-test? Using the fact that Martha believes the treatment will reduce the amount of time to fall asleep, state the null and alternative hypothesis. Use = 0:05. What is tcrit Calculate tobt. What should Martha conclude?

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