Researchers at the Mayo Clinic have studied the effect of sound levels on patient healing and have..

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. (a) At _ = .05, has the mean been reduced? Show the
hypotheses, decision rule, and test statistic. (b) At _ = .05, has the
»

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. (a) At _ = .05, has the mean been reduced? Show the
hypotheses, decision rule, and test statistic. (b) At _ = .05, has the
variance changed? Show the hypotheses, decision rule, and test statistic. (See
Detroit Free Press, February 2, 2004, p. 8H.)

»

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