Two-variable data: line of best fit and correlation
Use a line of best fit to predict a value, or classify a correlation coefficient by strength and direction. Unlimited questions, five difficulty levels, and a full worked solution every time — free.
Try one
A line of best fit relates hours studied (x) to test score (%) (y): y = 1.5x + 63.5. Using this line, predict y when x = 17.
y = 1.5x + 63.5
Answer: 89
See one solved, step by step
A line of best fit relates distance from school (km) (x) to commute time (minutes) (y): y = 1.5x + 35. Using this line, predict y when x = 4.
y = 1.5x + 35
📘 Worked solution
1y = 1.5(4) + 35Substitute x = 4 into the line of best fit equation.
2= 41Multiply and then add or subtract to simplify.
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