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A 10 year study by the American Heart Association provided data on how age, blood pressure and smoking relate to the risk of strokes. Data from a portion of this study are shown below. Risk is interpreted as the probability (times 100) that a person will have a stroke over the next 10 year period. For the smoker variable, 1 indicates that the person is a smoker and 0 indicates a non-smoker.
A) If you could choose only 1 of the variables to help you predict the Risk, which variable would you choose? Why? How good would that model be, in terms of predicting the Risk?
B) Are there any of the independent variables that should not be in the model at the same time when you are trying to predict the Risk? If so, which variables? Why?
C) Develop the "best" regression model possible using this set of variables to help you predict the Risk. State your final model. Interpret the coefficients for the model (i.e. what do the numbers mean?). Finally, tell me how to use this model for predicting a person's risk of a stroke. Illustrate this with numbers and interpret its meaning.
A particular fast food restaurant is located near a University. 40% of the customers are students. Students prefer the spicier items.
40 were in favor of the Independent candidate, and 140 were undecided. At a 1% level of significance, test to see if the proportion of voters has changed. Calculate the value of the Chi-Square Test Statistic for this problem. What is it?
In the study of fingerprints, an important quantitative characteristic is the total ridge count for the 10 fingers of the individual.
A survey of undergraduate students in the School of Business at Northern University revealed the following regarding the gender and majors of the students:
Estimating the individual score using normal distribution and find the minimum SAT score needed to be accepted?
A DVD rental store wants to know what proportions of its customers are under age 21. A simple random sample of 500 customers was taken, and 375 of them were under age 21. Presume that the true population proportion of customers under age 21 is 0.6..
Investment A has an expected return of $25 million and Investment B has an expected return of $5 million. Market risk analysts believe the standard deviation of the return from A is $10 million
we wish to estimate the mean using a sample size of n = 49. Find the probability that we could be correct within 1kg/m 2 .
You should use the hypergeometric distribution because you are sampling a small population without replacement.you are sampling a large population without replacement. You are sampling a small population with replacement.
For a normal population with u. = 80 and a = 20 which of the following samples is least likely to be obtained?
What is the null hypothesis? What is your decision if a = 0.01?
She wants to test H0: μ = 0.5 Ha: μ ≠ 0.5 Find the associated P-value. Is the result significant at the 5% level (α = 0.05)? At the 1% level (α = 0.01)?
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