Question

6. Describing the relationship between two nominal variables Myocardial infarction can be safely and effectively treated with aspirin, but how often aspirin is prescribed in actual medical practice is not well known. In particular, elderly patients are often at risk of not receiving aspirin when hospitalized for acute myocardial infarction. To address this issue, doctors conducted a study as part of the Cooperative Cardiovascular Project to determine how often aspirin is prescribed to elderly (265 years old) patients hospitalized for myocardial infarction. (Source: Krumholz, H.M., Radford, M. J., Ellerbeck, E. F., et al. (1995). Aspirin in the Treatment of Acute Myocardial infarction in Elderly Medicare Beneficiaries. Circulation, 92, 2841-2847.] Imagine that you conduct a similar study and find that among 10,021 patients 65 years of age or older, 6,011 patients received aspirin within the first 2 days of hospitalization. When grouped by age bracket, the study shows that aspirin was prescribed to 2,705 of 4,068 patients between 65 and 74 years of age, 2,284 of 3,928 patients between 75 and 84 years of age, and 1,022 of 2,025 patients 85 years of age or older. Complete the following cross-classification table by entering a value in each of the 10 empty boxes Treatment Aspirin No Aspirin Total Age Group 65-74 75-84 Total 6,011 10,021 Refer to the following barchart as you answer the questions that follow

Answer 1

Age group	Aspirin	No aspirin	Total
65-74	2705	1363	4068
74-84	2284	1644	3928
>=85	1022	1003	2025
Total	6,011	4010	10,021

Everything provided in the problem set marked in bold, rest of the table filled as required, hope this helps!