Understanding Lines of Best Fit

What is the primary purpose of a line of best fit?

• To make the graph look symmetrical

• To ensure the line passes through the origin

• To identify trends in data

• To connect all data points perfectly

Why is it generally incorrect to draw a line of best fit through the origin?

• Because it is too difficult to draw accurately

• Because it makes the graph look unbalanced

• Because most relationships do not start at zero

• Because it always results in a negative correlation

What advice does the examiner give regarding lines of best fit in exams?

• Use a colored pen for clarity

• Avoid drawing any lines

• Always draw the line through the origin

• Focus on the data rather than the origin

What is a potential risk of extrapolating data beyond the original range?

• The data becomes more accurate

• The predictions may become unrealistic

• The line of best fit becomes a curve

• The graph becomes too cluttered

How should you describe a positive correlation in real-world terms?

• As one variable increases, the other decreases

• As one variable increases, the other remains constant

• As one variable increases, the other also increases

• As one variable decreases, the other increases