Experimental evaluation of the effectiveness of projected transparencies on instruction in vocational agriculture

scores resulted in the highest correlations with the posttest mean scores. When the two groups of schools were compared on DAT, mechanical, it was noted that the control group of schools scored higher than did the transparency schools. Although the DAT, mechanical scores for the treatment group of schools were lower than for the control group of schools, the posttest results of the transparency group were equal to those of the control group. This would tend to indicate that the use of the prepared overhead transparencies did increase student achieve­ ment. Scores from the Nebraska Agriculture Achievement and the Intelligence Quotient tests were correlated at a higher level with posttest mean scores In the farm credit subject matter area for the treatment group of schools. The highest correla­ tion values in the control group of schools were between posttest scores and scores on the Kuder Outdoor, Intelligence Quotient and Nebraska Agriculture Achievement tests. When the two groups of schools were compared, it was found that the treatment group of schools* correlation values were all lower than those of the control group of schools. The researcher feels that if a group of students score low on a selected variable, but perform well on the posttest, transpar­ encies did contribute to the student achievement. — —" — I • 4# WW» I T m "1 3 XUliu X X wiii vliC X vc%.a.u.cu> o v; vw-w. xcx^c^v uixc* w the Nebraska Agriculture Achievement and the Intelligence