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?
The independent variable for A, B, and C is postnatal age in hours. The dependent variables for A, B, and C are systolic blood pressure, diastolic blood pressure, and mean blood pressure respectively. The relationships between these variable is direct and positive in that as the independent variable of postnatal age increases the corresponding dependent variable increases.
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?
The independent and dependent variables in Figure 3 are the same as in Figure 2, as well as the relationship between the variable. The difference is that figure 3 displays the relationship with regard to infants with a body weight of 1001-1500 grams, and figure 2 deals with infants with a body weight equal to or lesser than 1000.
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.
According to figure 3, “in each instance, the y intercept was significantly greater (p < 0.001) than the value for comparable lines of best fit in infants with birth weight ≤1,000 grams.” This is evident when comparing the y-intercepts in each graph.
Yˆ represents the predicted value of y calculated using the equation Yˆ = a + bx. In Figure 2, the formula for SBP is Yˆ = 43.2 + 0.17x. Identify the y intercept and the slope in this formula. What does x represent in this formula?
According to the equation, the y-intercept is 43.2 and the slop is 0.17. “x” represents the independent variable of postnatal age in hours.
In the legend beneath Figure 2, the authors give an equation indicating that systolic blood pressure is SBP = 43.2 + 0.17x. If...