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05 level 24 clock hours 4-choice analysis of variance CD CD CD CM CM CM control groups control subjects course of instruction criterion measures criterion tests Department of Industrial eleven unit tests evaluate experimental and control experimental group experimental treatment fall sessions film course film lesson film presentations final course examination final examination High School In-Service Vocational-Industrial Teacher included eleven unit Industrial Education Initial In-Service Vocational-Industrial initial learning instructional materials integrated lecture-discussion investigators method of instruction Minneapolis Minnesota Research Coordination packaged course consist potential instructors Pre-Service and Initial pre-test data presented in Table Relative Effectiveness relevance Research Coordination Unit resultant film-discussion materials scores Seminar Discussion Leader's Sign Test significant differences sound film structuring and presenting study sample summer and fall Teacher Education Lessons teacher training teaching test items tests and final treatment groups typical unit achievement test University of Minnesota Vocational-Industrial Teacher Education Vocational-Technical Schools