6. You are a RN working in a substance abuse clinic and you are interested in assessing carbohydrate deficient transferria (CDT) because CDT is a marker for alcohol abuse. You evaluated paired serum (S) and dry blood spot (DBS) specimens simultaneously for CDT in 25 clients randomly selected at the clinic. The data (in densitometery units - DU) are provided in the table below. You would prefer use of dry blood spots for analysis of CDT because it involves simplified sampling, storage, and transportation of specimens compared to serum (S) specimens (currently used to assess CDT). Use the data set below to answer the following questions. Assume a=0.05. Specimen # S 1 DBS 64 23 Specimen # 14 S DBS 2 74 9 3 38 15 13 75 37 10 8 4 103 16 53 17 7 5 17 10 9 38 6 22 18 14 9 18 9 7 19 33 15 9 8 20 10 20 70 31 9 5 21 31 61 26 10 14 30 22 15 42 11 23 14 28 12 20 24 10 12 16 9 58 26 13 25 13 7 31 12 a. Use SPSS to run the appropriate regression to determine whether DBS should be given consideration as an alternative to S specimens for assessing CDT. Select one appropriate statistic provided by the SPSS output to support your assessment of DBS for assessing CDT. [1 Mark] b. What is the predicted value S for DBS = 31? Show your calculation. [1 Mark] c. What is the value of R-squared for the regression model? Explain what R-squared represents in words. [2 Marks]