For this problem consider the following information from an experiment to compare differences between the length of time a house paint lasts before it begins to fade. The number of subjects are the same in each group. 
, , , The value of t obt for the planned comparison of and is _________.
Definitions:
Slope
is a measure of the steepness or inclination of a line, indicating the rate at which one variable changes with respect to another.
Regression Line
A line through a scatter plot of data points that best expresses the relationship between those points.
Textbooks
Books specifically designed to support instruction in a subject area, often used as a primary source of information in education.
Slope
The measure of the steepness and direction of a line, indicating the rate of change from one point to another.
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