Question

In: Statistics and Probability

A major health care organization conducted a study relating the risk of heart attack to a...

A major health care organization conducted a study relating the risk of heart attack to a patient's age, blood pressure, and HDL cholesterol. They have hypothesized the following relationship:

                                                Y = ?0 + ?1X1 + ?2X2 + ?3X3

where Y is heart attack risk, Xl is patient's age, X2 is blood pressure, and X3 is HDL level. Data are collected and a regression relationship is determined through the use of the computer. The following Excel output is obtained:

Regression Statistics              ANOVA               df              SS        MS           F         Significance F
Multiple R        .828                Regression              3        3201.82    1067.27 11.66        .0003
R Square          .686               Residual (Error)    16        1464.98       91.56
Standard Error  9.57               Total                      19        4666.80
Observations     20

                        Coefficients               Standard Error         t-Stat               P-Value
Intercept          -101.92                                    -                           -                        -
X1                          1.1400                               0.2554                  4.463               .0004
X2                          0.3521                               0.0744                  4.367               .0005
X3                         -0.0935                               0.3108                - 0.301               .7674

The result of conducting the hypothesis test described in the previous question at the 5% level of significance is??????????

The value of the sample multiple coefficient of determination is????????????????

we can say that ______________ percent of the variation in heart attack risk, y, is explained by the regression relationship.?????

The result of conducting a hypothesis to determine if the relationship between heart attack risk and HDL Level is significant at the alpha=0.05 level is????????

Based on your answers to the last few questions, you may make which of the following statements about the regression relationship

Solutions

Expert Solution

null hypothesis H0 :model is not significant

alternative hypothesis H1: model is significant

Decision rule :-

i) if F calculated < Fcritical then accept null hypothesis H0 at level of significance 0.05

ii) if F calculated > Fcritical then reject  null hypothesis H0 at level of significance 0.05

a) The result of conducting the hypothesis test described in the previous question at the 5% level of significance is

from the anova table ,Fcalculated(11.66) > Fsignificant( .0003) so reject the null hypothesis

so the model is significant

b) The value of the sample multiple coefficient of determination is 0.828 (from table Multiple R )

c) we can say that 9.57 percent of the variation in heart attack risk, y, is explained by the regression relationship.

=> because for finding variation in the model we use standard error.it useful to calculate the vatiation in the response variable so it is 9.57

d) The result of conducting a hypothesis to determine if the relationship between heart attack risk and HDL Level is significant at the alpha=0.05 level is

=>Decision rule :-

i) if p value > 0.05 l.o.s then accept null hypothesis H0 at level of significance 0.05

ii) if p value < 0.05 l.o.s if then reject  null hypothesis H0 at level of significance 0.05

here pvalue( 0.7674) > 0.05 level of significance so accept null hypothesis that there is no effect of HDLcholesterol level on heart attack

conclusion :- from the above model regression relationship we can say that the model is good and there is significant effect of patients age and blood pressure but not of HDL level


Related Solutions

In 2007, a study was conducted to compare two treatments for people experiencing a heart attack....
In 2007, a study was conducted to compare two treatments for people experiencing a heart attack. In Atlanta, 300 patients were assigned randomly to treatments: 125 to treatment 1 and 175 to treatment 2. A total of 88 patients survived their heart attack: 32 in the group receiving treatment 1 and 56 in the group receiving treatment 2. A test of significance was conducted on these hypotheses: H0: The survival rates for the two treatments are equal. Ha: Treatment 2...
Calculate your risk of having a heart attack by completing the American heart association’s Risk Calculator.The...
Calculate your risk of having a heart attack by completing the American heart association’s Risk Calculator.The calculator requires some health information that you may not know, in that case you will need to guess. However, consider getting that information if you don’t know. Did the result surprise you? Why or why not? Discuss ways you think your diet can be modified to reduce the risk heart attack and/or discuss ways your diet already reduces the risk of heart attack.
1- in health care orgnzation : we examined health care organization in terms of three major...
1- in health care orgnzation : we examined health care organization in terms of three major aspects: cultural, operational and strategic: and then looked at each of the major functional areas, such as clinical, physician organzation , nursing, HR, finance, marketing and strategy, Enviroment of care and others. Why would it be helpful for a manger, who may be working in only one department, to understand what everyone else does? 2- please describe at least three utility systems for which...
The Black Women's Health Study, a study of risk factors for coronary heart disease in African...
The Black Women's Health Study, a study of risk factors for coronary heart disease in African American women, consisted of 352 women who reported having had a heart attack (cases), who were matched on age with 1760 controls (Am J Epi 1999; 150:904-909). The following data summarize some of the findings. History of Heart Attack in a Parent Case Control Total No 169 1082 1251 Yes: at age 50+ 91 329 420 Yes: before age 50 53 106 159 Total...
Define, understand, and discuss some of the major risk factors for health and health care disparities...
Define, understand, and discuss some of the major risk factors for health and health care disparities and why they are associated with poorer outcomes among some multicultural populations.
cholesterol is the major bio-molecule that causes heart attack; this molecule is classified as a steroid....
cholesterol is the major bio-molecule that causes heart attack; this molecule is classified as a steroid. the molecule contains a double bond where is this located?
Does regular exercise reduce the risk of a heart attack in males over 40 years of age? Here are two ways to study this question.
Does regular exercise reduce the risk of a heart attack in males over 40 years of age? Here are two ways to study this question.STUDY A: A medical researcher finds 2000 men over 40 who have had heart attacks. She also finds 2000 men over 40 who have not had a heart attack. She asks each man in each group whether they exercised regularly as part of his usual lifestyle.STUDY B: Another researcher finds 4000 men over 40 who have...
In this article, researchers evaluated links between playing golf and the risk of stroke, heart attack,...
In this article, researchers evaluated links between playing golf and the risk of stroke, heart attack, or death. Golfing at least once a month may lower a person's risk of early death, according to new research presented on Wednesday at the American Stroke Association's International Stroke Conference 2020. The sport, a favorite of presidents from Woodrow Wilson and Calvin Coolidge to Barack Obama, and Donald Trump is a gentle activity, with very few opportunities for high-intensity exercise. But the study,...
In the article, researchers evaluated links between playing golf and the risk of stroke, heart attack,...
In the article, researchers evaluated links between playing golf and the risk of stroke, heart attack, or death. Golfing at least once a month may lower a person's risk of early death, according to new research presented on Wednesday at the American Stroke Association's International Stroke Conference 2020. The sport, a favorite of presidents from Woodrow Wilson and Calvin Coolidge to Barack Obama, and Donald Trump is a gentle activity, with very few opportunities for high-intensity exercise. But the study,...
A study compared patients who suffered a heart attack in the daytime with patients who suffered...
A study compared patients who suffered a heart attack in the daytime with patients who suffered a heart attack in the night.  Of 58,593 had a heart attack in the daytime 11,604 survived.  Of 28,155 who had a heart attack at night 4139 survived.  Use α = .01 and test the claim that the survival rates are the same.
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT