Q1.1 Expected Values 2 Points A study involved 2121 patients who were MRSA (methicillin-resistant staphylococcus aureus) carriers. Upon discharge from the hospital, all patients were given information on how to avoid infection. 1058 patients were randomly assigned special cleaning products and told to use them for six months. At the end of the study period, 98 of the 1063 patients in the education-only group developed a MRSA infection while 67 of the 1058 patients in the deep-clean group developed a MRSA infection. Developed MRSA After Discharge Yes No Total Education-only Deep-cleaning routine 98 965 1063 67 991 1058 Totals 165 1956 2121 On your own piece of paper, compute the expected values for each of the data cells, showing your work. (Please identify which cell those expected values belong in!) Then take a picture of your work and upload it where indicated. Please select file(s) Select file(s) Submit Gradescope Written A gradescope.com/courses/682711/assignments/3800720/submissions/new ill gradescope 0/8 Questions Answered Q1.2 Components of Chi-Square 2 Points Compute each component of the Chi-square statistic, showing your work on your own piece of paper. Then use those components to find the value of Chi-square. Take a picture of your work and upload it where indicated. Please select file(s) Select file(s) Save Answer Q1.3 Degrees of Freedom 1 Point Calculate the degrees of freedom for this test and put the answer in the answer box. Just the number! Save Answer Q1.4 P-value 2 Points Use X cdf to find the P-value associated with your Chi-square value from part (1.2) with its df from part (1.3). Please be sure to write the calculator command with appropriate inputs followed by this P-value. New Chrome available : Q2 Cardiac Study 8 Points Q2.1 Hypotheses 2 Points In a clinical trial to compare the effectiveness of two drugs in preventing heart attacks, 25,620 patients were randomly divided into three groups. One group took a tablet of drug A each day. The next group took a table of drug B each day. The third group took one table of each drug each day. Patients were studied for 56 months and the number of who suffered heart attacks (fatal and non-fatal) were counted. Write the appropriate hypotheses to test if there would be an association between these treatments and cardiac outcome. Save Answer Q2.2 Conditions 2 Points Values in the table represent counts, (expected values), and [Chi-square components] for this study. Drug A Drug B Both drugs Fatal Heart Attack 598 (607.14) [0.1376] 603 (609.56) [0.0706] 620 (604.30) [0.4079] Non-Fatal Heart Attack 431 (418.43) [0.3776] 400 (420.10) [0.9617] 424 (416.47) [0.1362] No Heart Attack 7513 (7516.43) [0.0016] 7573 (7546.34) [0.0942] 7458 (7481.23) [0.0721] Is the sample size of 25,620 large enough? Explain how you know. Q2.3 Mechanics 2 Points Values in the table represent counts, (expected values), and [Chi-square components] for this study. Drug A Drug B Both drugs Fatal Heart Attack 598 (607.14) [0.1376] Non-Fatal Heart Attack 431 (418.43) [0.3776] 603 (609.56) [0.0706] 620 (604.30) [0.4079] 400 (420.10) [0.9617] 424 (416.47) [0.1362] No Heart Attack 7513 (7516.43) [0.0016] 7573 (7546.34) [0.0942] 7458 (7481.23) [0.0721] Find the value of Chi-square, the degrees of freedom, and the P-value for this test and list them in the space provided. Save Answer Q2.4 Decision Linked in Context 2 Points Based on your results in part (2.3), make a decision linked in context. Save Answer