Section Exercise 10-38 (Algo) Researchers at the Mayo Clinic have studied the effect of sound levels on patient healing and have found a significant association (ouder 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. New Flooring Old Flooring 44 44 41 39 38 43 54 49 47 52 Click here for the Excel Data File (a-1) Does the evidence convince you that the mean sound level has been reduced? Select the appropriate hypotheses. a Hg: H1-HO vs.: H1-H 0 Ob c (a-2) At a 05, what is the decision rule? Assume equal variances. a Reject the null hypothesis if catc>-1.86 (8 d.f.) b. Reject the null hypothesis if calc-1.86 (8 d.f.) a b (a-3) Calculate the test statistic. (Round your answer to 4 decimal places. Input the answer as a positive value.) Test statistic (a-4) At a 05, is the mean sound level reduced? Reject Ha, the mean has been reduced. (b-1) At a .05, has the variance changed? Choose the correct hypothesis. Hp: 02/02 = 1 vs. H:0 10 #1 102 1. Ob (b-2) At a 05, what is the decision rule? a Reject Hy if Fcatc 1042 (d.f. = 4, d.f = 4.) b. Reject Hy if Fcalc >9.60 or Fcatc