Question

Which is the best interpretation of the y-intercept for this model?

A) People who can't type need about 10.6 hours of training
B) Before undergoing this training, typists' average speed was about 10.6 words per minute.
C) The y-intercept is meaningless here because no one types at 0 wpm.
D) The y-intercept is meaningless here because none of the typists had 0 hours of training.

Answer 1

The y-intercept in a linear model represents the value of the dependent variable when the independent variable is zero. It can provide meaningful insights in some contexts but may not be useful in others where the scenario does not realistically allow an independent variable to reach zero.

Step-by-step explanation:

The y-intercept of a linear model provides information about the value of the dependent variable when the independent variable equals zero. In some contexts, such as a model relating typing speed to training hours, the y-intercept can indicate a baseline measure before training begins. However, if the scenario does not realistically allow for an independent variable to be zero, such as no training hours or a scenario where a heart rate is measured while resting rather than during an activity, the y-intercept may not provide a meaningful interpretation. In certain scientific experiments, the y-intercept can represent a baseline reading, ensuring that equipment and measurements are calibrated correctly.