Description:

Plavix is a drug that is given to angioplasty patients to help prevent blood clots. A researcher at McMaster University organized a study that involved 12,562 patients in 482 hospitals in 28 countries. All the patients had acute coronary syndrome, which produces mild heart attacks or unstable angina, chest pain that may precede a heart attack. The patients were divided into two equal groups. Group 1 received daily Plavix pills, while group 2 received a placebo. After 1 year 9.3% of patients on Plavix suffered a stroke or new heart attack, or had died of cardiovascular disease, compared with 11.5% of those who took the placebo.

1) This is about two populations comparison. is this for two population Proportions comparison?

If your answer is No, that indicates the problem is for two population means comparison.

Select - Yes or no

2) What is the Overall P bar (proportion of the total 12,562 patients who suffered a stroke or a new heart attack or had died of heart disease)? (Something in between 0.093 and 0.115), don't put % sign, put decimal format with 3 decimals.

3) What is the Standard Error? (that long formula), with5decimals.

4) What is the Z-value? 2 decimals

5) What is the p-value? 6 decimals (without %)

If it is 0.00345%, write 0.000035.

6) What is your conclusion? Choose one.

a. We don't have enough statistical evidence to reject the NULL hypothesis.

b.Not enough information for me to make that a conclusion

c. We have overwhelming statistical evidence to reject the NULL and accept the alternative hypothesis.

That means, taking drug Plavix can really reduce your chance to get a heart attack.

d. We haveoverwhelmingstatistical evidence to reject the NULL and accept the alternative hypothesis.

That means, taking the drug Plavix may reduce your chance to get a heart attack.

7) Describe your statistical analysis in a paragraph report to the marketing manager of the pharmaceutical company.

Tip: What the significance means in this case?