Reference no: EM132858010

Migraine and Acupuncture: Treatment Control Total

A migraine is a particularly painful type of headache, which patients sometimes wish to treat with acupuncture. To determine whether acupuncture relieves migraine pain, researchers conducted a randomized controlled study where 155 patients diagnosed with migraine headaches were randomly assigned to one of two groups: treatment or control. 80 patients in the treatment group received acupuncture that is specifically designed to treat migraines. 75 patients in the control group received placebo acupuncture (needle insertion at non-acupoint locations). 24 hours after patients received acupuncture, they were asked if they were pain free. Results are summarized in the contingency table below. Test to see if migraine pain relief is dependent on receiving acupuncture. Use α= 0.1.

Pain Free:Yes Pain Free: No Total

22 58 80

6 69 75

28 127 155

a) What is the correct null hypothesis?

b) Fill in the expected values, round answers to at least 1 decimal place.

Expected Values Pain Free: Yes Pain Free: No

Treatment ____ ____

Control ____ ____

c) Find the test statistic, round answer to at least 2 decimal places.

d) What is the P-value? (Round answer to at least 3 decimal places)