After creating a scatter plot, you notice that all the points on the plot lie along a horizontal line. this means that:
a. the data set has a positive trend.
b. the data set has a negative trend.
c. all the x-values in the data are the same.
d. all the y-values in the data are the same.

option D. all the y-values in the data are the same.

Remember that the vertical axis is the y-axis. If you have a horizontal line it means that the slope of the line is zero and the function is of the kind y = constant. This is, no matter what the value of x is, the value of y is always the same (the constant).