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# HLT362V stats for nursing exercise 6,8,9 and 27

EXERCISE 27 Questions to be Graded

- 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 fit in Figure 2 from the*y*intercept for the lines of best fit in Figure 3? Provide a rationale for your answer. - 4.
*Ŷ*represents the predicted value of*y*calculated using the equation*Ŷ*=*a*+*bx*. In Figure 2, the formula for SBP is*Ŷ*= 43.2 + 0.17*x*. 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 + 0.17
*x*. If the value of*x*is postnatal age of 30 hours, what is the value for*Ŷ*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 + 0.12
*x*. If the value of*x*is postnatal age of 30 hours, what is the value for*Ŷ*or SBP for neonates 1,001–1,500 grams? Show your calculations. - 7. Compare the SBP readings you found in Questions 5 and 6. Explain the difference in these two readings.
- 8. In the legend beneath Figure 2, the authors give an equation indicating that diastolic blood pressure is DBP = 25.8 + 0.13
*x*. If the value of*x*is postnatal age of 30 hours, what is the value for*Ŷ*for neonates ≤ 1,000 grams? Show your calculations. - 9. In the legend beneath Figure 3, the authors give an equation indicating that diastolic blood pressure is DBP = 30.4 + 0.11
*x*. If the value of*x*is postnatal age of 30 hours, what is the value for*Ŷ*for neonates 1,001–1,500 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 + 0.11
*x*. How different is the DBP when the value of*x*is postnatal age of 60 hours versus the 30 hours examined in Question 9?