Pressure smoker 0388163 030895167 0680448 0166646 SUMMARY OUTPUT Regression Stat

Question

Pressure smoker 0388163 030895167 0680448 0166646 SUMMARY OUTPUT Regression Statistics Multiple R 0,934605 0873487 Adjusted R Square 0.849766 3 73959 1220.247 36.82301 20404 Regression 16- 500.210412 53.1315. 19 l 4190.95 coefficients Error Stat P-value Lower 9 t -91.7595 5.222760 -602778 1.76E-05. 124 0303 Intercept 1.076741 724913 Age 004522552 556795 4 24E-o5 2378426 Pressure 8739871 300081513 291249 001017 smoker Refer to Excel output of problem 37, and answer the following questions: 1. Referring to Excel output, what fraction of the variability in chance of stroke is explained by age, blood pressure, and smoking habit? a) 27.0% b) 33.4% 87.3% 86.5% ANSWER: TYPE: MC DIFFICULTY: Easy KEYWORDS: coefficient of multiple determination, interpretation

Explanation / Answer

1. Since the value of R-square is 0.873. So 87.3% variation has been explained. So option (c) is the correct choice.2. Since all the individual p-values are lesser than 2% i.e. 0.02, so all the variables are significant individually. So option (b) is the correct choice.

3. Additional percentage is (87 - 23)% = 64%, so option (b) is the correct choice.

4. Among the given values 0.02 is the smallest, for which all the variables are significant individually. So option (d) is the correct choice.

5. If we take level of significance to be 0.01, then the variable smoker is not significant but other two variables are significant.So option (a) is the correct choice.

6. The correct choice is (d) 0.05.

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