Researchers were interested in whether patients with a history of angina are more likely to take anticoagulant drugs. (5 points)
angina2 * Taking anticoagulant drugs Crosstabulation 

Taking anticoagulant drugs 
Total 

Yes 
No 

Angina 
Yes 
Count 
311 
25 
336 
Expected Count 
177.3 
158.7 
336.0 

Std. Residual 
10.0 
10.6 

No 
Count 
242 
470 
712 

Expected Count 
375.7 
336.3 
712.0 

Std. Residual 
6.9 
7.3 

Total 
Count 
553 
495 
1048 

Expected Count 
553.0 
495.0 
1048.0 
Value 
df 
Asymp. Sig. (2sided) 
Exact Sig. (2sided) 
Exact Sig. (1sided) 

Pearson ChiSquare 
314.204 
1 
.000 

Continuity Correction^{b} 
311.859 
1 
.000 

Likelihood Ratio 
358.893 
1 
.000 

Fisher's Exact Test 
.000 
.000 

LinearbyLinear Association 
313.904 
1 
.000 

N of Valid Cases 
1048 

Value 
95% Confidence Interval 

Lower 
Upper 

Odds Ratio for angina2 (Yes / No) 
24.160 
15.623 
37.363 

For cohort Taking anticoagulant drugs = Yes 
2.723 
2.447 
3.030 

For cohort Taking anticoagulant drugs = No 
.113 
.077 
.165 

N of Valid Cases 
1048 

Interpret the relative risk for those patients who take anticoagulant medications
Researchers were interested in whether patients with a history of angina are more likely to take anticoagulant drugs.
Identify the null and alternate hypothesis.
Ho: There is no association between history of angina and taking anticoagulant drugs
H1: There is an association between history of angina and taking anticoagulant drugs
Interpret test statistic and state conclusion based on original hypothesis. Assume alpha = .05
Calculated chi square 314.204 , P=0.000 which is < 0.05 level of significance. Ho is rejected. We conclude that there is significant association between history of angina and taking anticoagulant drugs
Interpret the odds ratio based on original research hypothesis.
Odds ratio =24.16
People with history of angina are taking anticoagulant drugs 24.16 times more compared to People with no history of angina.
Interpret the relative risk for those patients who take anticoagulant medications
relative risk = (311/553)/(25/495) = 11.14
The relative risk of taking anticoagulant medications is 11.14 times that of people with history of angina compared to no history of angina.
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