Researchers at the Mayo Clinic have studied the effect of sound levels on patient healing and have found a significant association (louder hospital ambient sound level is associated with slower postsurgical healing). Based on the Mayo Clinic's experience, Ardmore Hospital installed a new vinyl flooring that is supposed to reduce the mean sound level (decibels) in the hospital corridors. The sound level is measured at five randomly selected times in the main corridor. What is the test statistic? New Flooring          Old Flooring  44                             50 37                             51 41                             51 40                             48 39                             48

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A: New Flooring    Old Flooring 42                           48 41                            51 40…

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