Question

The scatter plot below represents the change in global sea level from 1993-2017, according to the National Aeronautics and Space Administration (NASA)

The equation of the regression line is written below, where Y represents the predicted change in sea level and t represents the years since 1993.
y = 0 + 3.2t

Part a:
Identify the y-intercept of the regression line and explain what it represents in the context of the data.

Answer 1

The y-intercept is zero and it means that in the year 1993 there was no change in the seawater level.

Explanation:

See the scatter plot graph attached.

It represents the change in global sea level from 1993-2017, according to the National Aeronautics and Space Administration (NASA).

The equation of the regression line is written below, where Y represents the predicted change in sea level in mm and t represents the years since 1993.

y = 0 + 3.2t .............. (1)

Therefore, the equation is in the slope-intercept form and the y-intercept is zero for this graph.

That means in the year 1993 there was no change in the seawater level. (Answer)