Trendlines practice
Below are some practice questions involving trendlines:
1. Interpret the trendline below:
Answer: The trendline indicates an overall upward trend in the data points, with some variability around the trendline.
2. Calculate the equation of the trendline for the following data points:
x: 1, 2, 3, 4, 5
y: 2, 4, 6, 8, 10
Answer: The equation of the trendline is y = 2x
3. Determine if the trendline shown in the graph below is a good fit for the data points:
Answer: The trendline appears to be a good fit for the data points as it captures the overall trend of the data accurately.
4. Calculate the correlation coefficient for the data points below:
x: 1, 2, 3, 4, 5
y: 3, 5, 7, 9, 11
Answer: The correlation coefficient is 1, indicating a perfect positive correlation between x and y.
5. Use the trendline equation y = 2x + 1 to predict the y-value when x = 6.
Answer: When x = 6, y = 2(6) + 1 = 12 + 1 = 13