Finding the line of best fit in a scatter graph can be tough for Year 10 students. Here are some challenges they face:

• Different Opinions: Each student might draw a different line because they see things in their own way.
• Data Clumps: Sometimes, groups of points or single points that are far from the rest can confuse the main trend.
• Not Simple Relationships: Not all things are related in a straight line, which makes it harder to find the right line.

Even with these difficulties, students can get better at it by:

1. Using Tech Tools: They can use graphing software to find the line using math instead of guessing.
2. Learning About Correlation: Understanding correlation helps. They can use a number called the correlation coefficient $r$ to see how well things are related.

Finding the line of best fit is important. It helps us make predictions and see how different variables connect with each other.