1. Which of the lines shown is a reasonable trend line for the scatter plot?
2. The scatter plot suggests a linear association between respiration and heart rates for adult males. Find an approximate equation for the trend line drawn for the data.
3. Estimation The scatter plot suggests a linear trend in the population of a certain city over time. Two points that lie on the trend line drawn are (18,31) and (82,72). Estimate an equation for the trend line that is drawn for the data.
4. Mental Math The scatter plot shows Leanna's elevation above sea level during her hike from the base to the top of a mountain. The plot suggests a linear association among the data. Two points that lie on the trend line drawn are (30,1070) and (75,1680).
a. Find an approximate equation for the trend line drawn.
b. Use mental math to find a similar equation if the base was 100 ft higher above sea level.