Boyd , Delost and Holcomb ( 1998 ) conducted a study to determine if significant gender differences existed in the mean amount of calcium levels in the blood among subjects 65 years of age and older . The researchers performed a retrospective chart review of laboratory procedures performed in six different physician practices . The nonmissing data consisted of 176 subjects The variables collected were SEX ( 1 = male , 2 - female ) , LAB ( lab where blood was analyzed ; Metpath , 2 = Deyor , 3 - St . Elizabeth 's , 4 - CB Rouche , 5 - YOU , 6 - Horizon ) , AGE ( years ) AKPHOS ( alkaline phosphatase , NU / L ) , and CAMMOL ( raw calcium , mmol [ ) . Using a 0.05 significance level and the given computer output , you now need to test the claim that the patients in the six physician practices ( or labs ) have different mean calcium levels by answering the questions that follow For questions 1 -5 examine the computer output of the five different models provided for you in the separate packet labeled SAS Output # 1 - SAS Output #S . Match the output with the most appropriate analysis . You may select each letter ( method ) more than once , once or not at all . ( 1 point each ) SAS Output # 1 a . One way ANOVA 2 . SAS Output # 2 b . Two way ANOVA with an interaction 3 . SAS Output # 3 C . Two - way ANOVA without an interaction 4 . SAS Output # 4 2. ANCOVA 5 . SAS Output #5 e . Multiple linear regression