Forty children participated in a study of the effectiveness of augmentative comm
ID: 3064087 • Letter: F
Question
Forty children participated in a study of the effectiveness of augmentative communication therapy. The children were matched for expressive language scores, intelligence scores, and age at the beginning of the study. One member of each matched pair was a child with autism and the other member of the matched pairs was a child with Down syndrome. Researchers hypothesized that children with Down Syndrome (D) would have more success with the therapy than children with Autism (A). Success was measured at the end of the 3 month study by the number of spontaneous communication attempts the children made using the augmentative communication device in a 4 hour afternoon session. What type of test should they use to test this hypothesis?
a z-test
a dependent samples t-test
an independent samples t-test
a single sample t-test
a z-test
a dependent samples t-test
an independent samples t-test
a single sample t-test
Explanation / Answer
Since the matched pairs are used, a dependent samples t-test is the most appropriate to test the hypothesis.