From: The Use of Sound-Field Amplification Devices in Different Types of Classrooms
Lang Speech Hear Serv Sch. 2011;42(4):395-407. doi:10.1044/0161-1461(2011/09-0080)
Legend:
Box and whisker plots of the participants' normalized gain scores ([posttest score − pretest score]/[maximum possible score − pretest score]) in
the test (SFA) and control (no SFA) classrooms in each school. In each subplot, the horizontal line represents the median score, the box
represents Tukey’s hinges (the 1st and 3rd quartiles), the error bars represent the 3rd quartile + 1.5 times the interquartile range (IQR) (upper)
and the 1st quartile − 1.5 times the IQR (lower), the circles represent individual scores > 1 but < 3 IQRs from the end of the box, and the
asterisks represent individual scores > 3 IQRs from
the end©ofAmerican
the box. The
n values show the sample sizes, and the Z and p values show the
Copyright
Speech-Languageresults
of
Mann–Whitney
U
testing
of
the
test
versus
control
classrooms
within
each school.
Date of download: 7/28/2017
Hearing Association