Assessing Aircraft Noise Conditions Affecting Student Learning, Volume 1: Final Report (2014)

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GLOSSARY AND ACRONYMS ANSI – American National Standards Institute. Confidence Interval, CI –an indication of the reliability of an estimate. CI is a term used in statistics that measures the probability that a population parameter will fall between two set values. The confidence interval can take any number of probabilities, with the most common being 95%. CCD – US Department of Education (ED) Common Core Database (CCD) which provides names and street addresses for public elementary and secondary schools in the US.. Cross-sectional Study – A cross-sectional study is one type of observational study that involves data collection from a population, or a representative subset, at one specific point in time. In this school study, for example, comparisons were made between test scores at different schools all in one year. DNL – The Day/Night Average Noise Level. Also Ldn. ESL – English as a Second Language. ETMS – Enhanced Traffic Management System. FICAN – Federal Interagency Committee on Noise. INCE-USA – Institute of Noise Control Engineering, USA Chapter. INM – Integrated Noise Model. Lamb – As used in this study, the ambient noise level at a location represents the total A- weighted noise level produced by all unidentifiable sources; that is, excluding major freeways and airports. Lday – The (energy) average A-weighted noise level over the daytime hours, usually 7am to 11pm. Also referred to as Leq16. Lnight - The (energy) average A-weighted noise level over the nighttime hours, usually 11 pm to 7am. Leq – The average (energy average) A-weighted noise level over a given period of time, in this study the 8-hour school day from 7am to 3pm. Also referred to as LAeq. Ldn – The Day/Night Average Noise Level in dB. Also DNL. Lmax - The highest A-weighted sound level measured during a single (aircraft) event in which the sound changes with time. Longitudinal Study – A longitudinal study is a correlational research study that involves repeated observations of the same variables over long periods of time, for example, monitoring school test scores over time. MAGENTA – Model for Assessing Global to Noise from Transport Aircraft. Monte Carlo Simulation – A computational algorithms that rely on repeated random sampling to obtain numerical results; typically one runs simulations many times over in order to obtain the distribution of an unknown probabilistic entity. A-1

NA(L) - Numbers of aircraft events above a threshold noise level L. NLSLSASD – National Longitudinal School-Level Test Score Database. Pugh Matrix - A method for concept selection using a scoring matrix in which alternatives are scored relative to weighted criteria. RANCH – Road Traffic and Aircraft Noise Exposure and Children’s Cognition and Health. SAT – Standardized test scores. SAS/GLM – SAS is a software suite developed by SAS Institute for advanced statistical analysis/ General Linear Model. SEL - Sound exposure level is a composite metric that represents both the intensity of a sound and its duration. SEL is a logarithmic measure of the total acoustic energy transmitted to the listener during the event. SII – Speech Intelligibility Index is a measure, ranging between 0.0 and 1.0 that is highly correlated with the intelligibility of speech. SIL – Speech Interference Level in dB is the (arithmetic) average of the noise levels in the 500, 1000, and 2000 Hz octave bands, used to characterize a noise signal in the frequency range where the human ear has its highest sensitivity Student’s t – A t-test is used to determine if two sets of data are significantly different from each other. TA(L) - Time in minutes above a threshold noise level. WHO – World Health Organization. Z Score – In statistics, the Z score, or standard score, is the number of standard deviations an observation or datum is above the mean. G&A-2