A researcher is interested in discovering whether a record of past violence could be used to predict differences on the scores obtained on the LSI (Level of Service Index)

among a presentenced group of male residents at a certain jail facility. (The LSI is used to indicate how serious a security threat a given resident might be while incarcerated and the test is given and scored during intake). The LSI is scored for Security risk as follows:

Scoring: Low Risk 0–2; Medium Risk 3–5; High Risk 6–8.

Group A: 3,8,5,5,6,3,2,5,6,7.

Group B: 2,4,3,3,5,4,2,2,3,2.

a. Find the t ratio.

b. Is it significant?

c. What type of research is this, experimental or post facto?

d. Identify both the IV and DV.