Public school districts across texas

Reference no: EM133589992

Question

A research study involved the random sampling of teachers from public school districts across Texas. The researchers randomly assigned each teacher to either a treatment or control group, gave all teachers the Texas Teacher Effectiveness Rating Scale as a measure of teacher effectiveness, conducted an intervention with the treatment group and gave all teachers the effectiveness rating scale again as the posttest. The results were published in a prominent educational journal and the findings generalized to public school teachers in the United States. What type of external validity is most likely threatened in this research example? Group of answer choices outcome validity treatment variation validity temporal validity population validity.

Reference no: EM133589992

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Public school districts across texas : A research study involved the random sampling of teachers from public school districts across Texas.

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