Question

Scenario 1 A group of researchers has recently collected data to investigate whether or not different kinds of performance feedback influences flow (a state of intense task absorption). In particular, they are interested in testing whether or not flow differs when participants are given feedback that is either positive or negative. The researchers have computed descriptive statistics, but are asking you to test the difference between groups. Positive Feedback: n = 30, M = 3.64, s = 0.40 Negative Feedback: n = 31, M = 3.21, s = 0.35

Identify the IV (and its levels) and the DV, and conduct a hypothesis test (including all steps) using the appropriate t-test (α = 0.05).

Scenario 2 A speech therapist developed a new technique for resolving stuttering in children and adolescents that involves use of a distractor to reduce speech-related anxiety. He recruited 8 current clients of his clinic to participate in a simple study. Each participant’s speech was assessed without the technique (pre-test control) and again while using the technique (post-test). The number of stutters were counted in each assessment, and the data are reported below. Does the therapist’s new technique appear to be working?

Identify the IV (and its levels) and the DV, and conduct a hypothesis test (including all steps) using the appropriate t-test (α = 0.01). Client 1 2 3 4 5 6 7 8 Pre-test 4 6 4 7 7 3 3 4 Post-test 4 5 5 4 2 2 3 1

Answer 1