Problem 2. Use logistic regression to analyze the following data set to determine the effect of treatment, covariate, and covariate-by-treatment interaction. Interpret all results. The drug is supposed to prevent sudden death from heart disease. Y-died of heart disease (yes/no) T-treatment (1-drug, 0-placebo) Z-cholesterol (covariate) YT Z 50 1 1 60 1 1 70 0 1 80 0 1 90 0 1 180 1 1 100 1 1 90 0000. 1 150 1 110 1 120 1 100 1 1 50 1 1 0000ooo oooo 1000101➖➖ 90 80 70 60 50 50 150 0 120 0 70 0 120 0 130

What does the y -intercept on the graph of a logistic equation correspond to for a population modeled by that equation?

Respiratory Rate Researchers have found that the 95 th percentile the value at which 95% of the data are at or below for respiratory rates in breath per minute during the first 3 years of infancy are given by y=101.82411-0.0125995x+0.00013401x2 for awake infants and y=101.72858-0.0139928x+0.00017646x2 for sleeping infants, where x is the age in months. Source: Pediatrics. a. What is the domain for each function? b. For each respiratory rate, is the rate decreasing or increasing over the first 3 years of life? Hint: Is the graph of the quadratic in the exponent opening upward or downward? Where is the vertex? c. Verify your answer to part b using a graphing calculator. d. For a 1- year-old infant in the 95 th percentile, how much higher is the walking respiratory rate then the sleeping respiratory rate? e. f.

Bill wants to explore factors affecting work stress. He would like to examine the relationship between age, number of years at the workplace, perceived social support, and work stress. He collects data on the variables from 100 employees (males and females) working in banks. Conduct a multiple regression analysis to answer the following questions: What is the relationship of age, number of years, and social support with work stress? Is the regression significant? If yes, what does it indicate? What is the regression equation for all the predictors? Write a results section based on your analysis that answers the research question. * last person got this wrong*