Question

< Back to Assignment Keep the Highest:14 Attention: Due to a bug in Google Chrome, this page may not function correctly. Click here to learn more Assumptions underlying the repeated-measures t test A Aa 4. Individuals with a condition known as "prosopagnosia·cannot recognize faces. Their per eptual abilities are intact, and they can accurately describe features such as eye color, size of the nose, and shape o the mouth. They can even tell you whether someone is attractive. However, they cannot recognize anyone's face, not even the faces of their friends and family. Dr. Joseph DeGutis has been conducting research and trying to develop a training regimen that would allow patients with prosopagnosia to improve their recognition abilities. Patients complete a battery of perceptual tests to determine their baseline performance (a pre-test) and then are trained for 6 days on a facial categorization task. They are tested again (a post-test) to determine their levels of improvement. Would it be valid for Dr. DeGutis to use the independent-measures t test to test whether the training leads to an O No, because he does not have homogeneity of variance. O No, because Dr. DeGutis is using a repeated-measures (within-subjects) research design, In this type of design, the study populations are not independent. O Yes. O Yes, if his sample size is 230 or the raw scores are normally distributed esc 2 4

Answer 1

Answer:

Correct option: No, because Dr. DeGutis is using repeated measures ( within subjects) research design. In this type of design, the study populations are not independent.

Note:

The Independent Samples t Test compares the means of two independent groups in order to determine whether there is statistical evidence that the associated population means are significantly different.

The dependent samples t-test (paired-samples t-test) compares the means between two related groups( or same group measured two times, before and after) on the same continuous, dependent variable.

Answer 2