1. The number of CDs (in millions) that were sold in 2007 was approximately 475 million.
2. The scatter plot shows a negative correlation between the number of hours spent studying and the number of hours spent watching TV, indicating that as study time increases, TV time tends to decrease.
3. The line of best fit for the data is y = -0.492x + 4.761, which suggests that for every additional hour spent studying, the predicted grade increases by approximately 0.492 points.
4. The equation for the line of best fit is y = 0.5x + 3.2, where x represents hours studied and y represents the predicted grade.
5. No, the line of best fit cannot be used to predict the grade for a student who studied for 10 hours because this value is outside the range of the data collected (extrapolation), and the relationship may not hold beyond the observed data.
Parent Tip: Review the logic above to help your child master the concept of scatter plots and line of best fit worksheet answers.
