For each of the following two scenarios/descriptions (pp.2), please select two responses, one to indicate the most appropriate test of inference, whether the test is directional (one way), non-directional (two-way), or cannot be determined
Test of inference Directionality of test:
(a) a one group t-test on means (f) directional
(b) a paired groups t-test on means (g) non-directional
(c) an independent groups t-test on means (h) neither
Description (2.a): To determine whether patients with Traumatic Brain Injury (TBI) have reduced problem solving ability, 35 TBI patients are compared with a group of 48 normal similar in terms of age, gender, and socio-economic status. Both groups are given a well known problem-solving task (so you can assume that there is no measurement problem)
The most appropriate significance test/test inference is: _____.
The alternative hypothesis/directionality of the test is _____.
Description (2. b): To determine whether a particular physical rehabilitation treatment changes the status of pain among patients who are suffering from lower back pain, 109 patients are administered a test of perceived pain both before the treatment, as well as six month post the treatment.
The most appropriate significance test/test inference is: _____.
The alternative hypothesis/directionality of the test is: ____.