Consider the following work breakdown structure: 
What is the estimated slack time for activity D?
Definitions:
Drop Height
The vertical distance through which an object is allowed to fall, often used in experiments to assess impacts or performance at various heights.
Linear Model
A linear model is a mathematical model that approximates the relationship between a dependent variable and one or more independent variables using a linear equation.
Scatterplot
A statistical graph type that illustrates the association between two variables by displaying data values for a dataset.
Regression Analysis
A technique in statistics for investigating how a dependent variable is related to one or more independent variables.
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