Question

math b - p(r) - s2
4-3: lesson quiz
which statement is true about using scatter plots to make predictions?
○ you cannot make predictions by visually using the trend line.
○ obscured text can be used to draw a trend line.
○ all you need is the slope of the trend line.
○ you can use the equation of a trend line to find the y-value of a given x-value.

Explanation:

• Trend lines on scatter plots allow visual and mathematical prediction. You can use the equation of a trend line (in the form $y=mx+b$) to calculate the corresponding y-value for a given x-value, which is a standard prediction method.
• The other statements are false: you CAN make visual predictions with a trend line, you need more than just slope to define a trend line (you need intercept or points), and while two points can make a line, a trend line should fit the overall data pattern, not just any two points.

Answer:

You can use the equation of a trend line to find the y-value of a given x-value.