A social worker wants to examine methods that can be used to deter truancy. Thre

Question

A social worker wants to examine methods that can be used to deter truancy. Three hundred chronically truant students from District 103 volunteer for the study. Because the social worker believes that socioeconomic class plays a role in truancy, she divides the 300 volunteers according to household income. Of the 300 students, 120 fall in the low-income category, 132 fall in the middle-income category, and the remaining 48 fall in the upper-income category. The students within each income category are randomly divided into three groups. The students in group 1 receive no intervention. The students in group 2 are treated with positive reinforcement in which, for each day the student is not truant, he or she receives a star that can be traded in for rewards. The students in group 3 are treated with negative reinforcement such that each truancy results in a 1- hour detention. After a full school year, the total number of truancies are compared. This is a

A) simple random sample.

B) stratified random sample

C) observational study.

D) completely randomized experiment.

E) randomized block experiment

Explanation / Answer

From the above stated way of sampling it is clear that it is RANDOMIZED BLOCK EXPERIMENT, because in this type of experiments Randomly selected sample is first devided into subcategorical subgroups called block, and the subgroups are randomly assigned to treatment. As in this Experiment sample of 300 is devided into it social income status and further it is randomly assigned to treatment in group 1, 2 and 3.

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