b) Describe the relationship in the x-y data plotted below: Quiz score vs chocolate consumption 1. 120 100 80 60 60 40 20 0 0 50 100 150 200 5. Change in pulse rate with exercise 2. 140 120 100 80 60 40 20 0 250 300 0 Daily Chocolate consumption (g) 3. 1400 Measured radioactive decay " 1200 1000 800 600 400 200 0 100 120 0 5 10 15 Time (mins) 40 60 80 20 Pulse rate before exercise (beats per minute) Identify the association (positive/negative/none) and correlation (strong/moderate/weak/none) present. PLOT 1 2 3 Association Correlation Estimate r (If approp.) Q.6 Appropriateness? Causation? Application? .... Explain at least two cautions that you should make when making interpretations of an x-y relationship using linear regression analysis. From this exercise, you should make sure you able to: draw a scatterplot: obtain a line of best fit for linear data and identify its equation obtain a residual plot obtain the correlation coefficient state what each of the items above tells you about the data.