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HLT 362 Module 5 Exercise 27 Simple Linear Regression

1. What are the independent and dependent variables in Figures 2, A, B, and C? How would you describe the relationship between the variables in Figures 2, A, B, and C?

2. What are the independent and dependent variables in Figures 3, A, B, and C? How would you describe the relationship between the variables in Figures 3, A, B, and C?

3. Was there a significant difference in the y intercept for the lines of best fi t in Figure 2 from the y intercept for the lines of best fi t in Figure 3? Provide a rationale for your answer.

4. ? represents the predicted value of y calculated using the equation ? a bx. In Figure 2, the formula for SBP is ? 43.2 0.17x. Identify the y intercept and the slope in this formula. What does x represent in this formula?

5. In the legend beneath Figure 2, the authors give an equation indicating that systolic blood pressure is SBP 43.2 0.17x. If the value of x is postnatal age of 30 hours, what is the value for ? or SBP for neonates ?1,000 grams? Show your calculations.

6. In the legend beneath Figure 2, the authors give an equation indicating that systolic blood pressure is SBP 50.3 0.12x. If the value of x is postnatal age of 30 hours, what is the value for ? or SBP for neonates 1,0011,500 grams? Show your calculations.

7. Using the values a 500 and b 20 in Figure 27-2, what is the predicted birth weight in grams for an infant at 36 weeks of gestation?

8. Compare the SBP readings you found in Questions 5 and 6. Explain the difference in these two readings.

9. In the legend beneath Figure 2, the authors give an equation indicating that diastolic blood pressure is DBP 25.8 0.13x. If the value of x is postnatal age of 30 hours, what is the value for ? for neonates ?1,000 grams? Show your calculations.

10. In the legend beneath Figure 3, the authors give an equation indicating that diastolic blood pressure is DBP 30.4 0.11x. If the value of x is postnatal age of 30 hours, what is the value for ? for neonates 1,0011,500 grams? Show your calculations.

11. In the legend beneath Figure 3, the authors give an equation indicating that diastolic blood pressure is DBP 30.4 0.11x. How different is the DBP when the value of x is postnatal age of 60 hours versus the 30 hours examined in Question 9?