Question

For a certain population, the regression equation to predict salary (in dollars) from education (in years) is y=2530x + 5200. What are the units of 2530 ? Choose the correct answer. You have only one attempt.

Answer 1

2530 has no units

Explanation:

In order to understand the units from a linear equation we need to understand the general equation of a line which is:

y=mx+b where:

m=slope of the line

b=y-intercept.

Comparing the given equation with the general line equation, we noticed that 2530 represents the slope of the line.

Since the slope can be obtained by:

m=(y2-y1)/(x2-x1) whatever the units are, the slope is dimensionless, which means that 2530 has no units.