Angina pectoris is a chronic heart condition in which the patient has periodic a
ID: 3431138 • Letter: A
Question
Angina pectoris is a chronic heart condition in which the patient has periodic attacks of chest pain. In a study to evaluate the effectiveness of the drug Timolol in preventing angina attacks, patients were randomly assigned to receive a daily dosage of either Timolol or placebo for 28 weeks. Here's the data .Use two hypothesis testing methods to test the effectiveness of using Timolol in preventing angina attacks.
Angina Free
No Angina Free
Timolol
44
116
Placebo
19
128
Angina Free
No Angina Free
Timolol
44
116
Placebo
19
128
Explanation / Answer
Null hypothesis: there is no effectiveness of using Timolol in preventing angina attacks.
Alternative hypothesis: there is the effectiveness of using Timolol in preventing angina attacks.
Angina Free No Angina Free Total Timolol Observed 44 116 160 Expected 32.83 127.17 160.00 (O - E)