Using Commas to Set Off Appositives and Interrupters

1. Some rooms in fact are full of echoes, dead zones, and mechanical noises that make it hard for students to hear.

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   Using Commas to Set Off Appositives and Interrupters - Question 1
2. The American Speech-Language-Hearing Association experts on how noise levels affect learning abilities has set guidelines for how much noise in a classroom is too much.

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   Using Commas to Set Off Appositives and Interrupters - Question 2
3. The association recommends that background noise the constant whirring or whining sounds made by radiators, lights, and other machines be no more than 35 decibels.

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   Using Commas to Set Off Appositives and Interrupters - Question 3
4. That level 35 decibels is about as loud as a whispering voice 15 feet away.

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   Using Commas to Set Off Appositives and Interrupters - Question 4
5. One study found a level of 65 decibels the volume of a vacuum cleaner in a number of classrooms around the country.

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   Using Commas to Set Off Appositives and Interrupters - Question 5
6. Other classroom noises came for example from ancient heating systems, whirring air-conditioning units, rattling windows, humming classroom computers, buzzing clocks, and the honking of traffic on nearby streets.

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   Using Commas to Set Off Appositives and Interrupters - Question 6
7. An increasing number of school districts are beginning to pay more attention to acoustics the study of sound when they plan new schools.

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   Using Commas to Set Off Appositives and Interrupters - Question 7
8. Some changes such as putting felt pads on the bottoms of chair and desk legs to keep them from scraping against the floor are simple and inexpensive.

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   Using Commas to Set Off Appositives and Interrupters - Question 8
9. Other changes however can be costly and controversial; these changes include buying thicker drapes, building thicker walls, or installing specially designed acoustic ceiling tiles.

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   Using Commas to Set Off Appositives and Interrupters - Question 9
10. School administrators often parents themselves hope that these improvements will result in a better learning environment for students.

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    Using Commas to Set Off Appositives and Interrupters - Question 10