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A researcher records the sound in decibels during a series

A researcher records the sound (in decibels) during a series of lessons taught by a substitute teacher at a local elementary school. In his study, he found that the sound was 20±2 (M±SD) decibels. Assuming the data are normally distributed, which of the following is an appropriate conclusion? A) 68% of classes were between... B) 95% of classes were between.

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Basic Statistics: A researcher records the sound in decibels during a series

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