Panasonic WX-LT350 The Impact of Sound - Page 4

...cont'd Design Each of the twelve classrooms acted as its own control. The two experimental conditions were unamplified "OFF" and amplified "ON". Classrooms 1-4 began the school year in the "ON" condition (two classrooms had one microphone; two classrooms had two microphones). Classrooms 5-8 began the school year in the "OFF" condition. At the mid-point of the school year the classrooms switched listening conditions. Classrooms 9-12 alternated between single-channel and dual-channel transmission options. Ninety-two percent of teachers used the amplification systems every day. Forty-two percent of teachers used amplification for more than one hour but less than two hours each time. Twenty-five percent of teachers reported using the systems for more than two hours each time. Results To reduce inflated results from outlying sources, the mean skill increases were calculated to get a true indication of how many skills were gained through amplification. Once the means were established, it the final results are a direct result of increases due to amplification and not other sources. The following graphs indicate the actual gain in skills from the use of classroom amplification: Skill increase 18 System On 16 System Off 14 12 10 8 6 4 2 0 -2 Reading Number Writing Reading Number Reading Number Writing Writing ENGLISH ENGLISH + NO ENGLISH [email protected] 877.268.7215