# Statistics Exercises 27 and 40

Pages: 3 (875 words) Published: October 12, 2012
Exercise 27
5. In the legend beneath Figure 2[->0], 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 Ŷ or SBP for neonates ≤1,000 grams? Show your calculations. Y = a + bx43.2 + 0.17(30) = 48.3

The SBP for neonates ≤1,000 grams at 30 hours is 48.3.
6. In the legend beneath Figure 2[->1], 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 Ŷ or SBP for neonates 1,001–1,500 grams? Show your calculations. Y = a + bx 50.3 + 0.12(30) = 53.9

The SBP for neonates between 1,001-1,500 grams at 30 hours is 53.9. 7. Compare the SBP readings you found in Questions 5 and 6. Explain the difference in these two readings. The y-value or systolic blood pressure increases with gestational weight. The neonates at a gestational weight of ≤1,000 grams will have a lower systolic blood pressure than those neonates between 1,001-1,500 grams. 8. In the legend beneath Figure 2[->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 Ŷ for neonates ≤ 1,000 grams? Show your calculations. Y = a + bx 25.8 + 0.13(30) = 29.7

The DBP for neonates ≤1,000 grams at 30 hours is 53.9.
9. In the legend beneath Figure 3[->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 Ŷ for neonates 1,001–1,500 grams? Show your calculations. Y = a + bx 30.4 + 0.11(30) = 33.7

The DBP for neonates between 1,001-1,500 grams at 30 hours is 53.9. 10. In the legend beneath Figure 3[->4], 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...