1. A study was conducted to investigate the relationship between age (in years) and BAC (blood alcohol concentration) measured when convicted DWI (driving while intoxicated) jail inmates were first arrested. Sample data are given below for randomly selected subjects.
Age 17.2 43.5 30.7 53.1 37.2 21.0 27.6 46.3
BAC 0.19 0.20 0.26 0.16 0.24 0.20 0.18 0.23
a. Police want to predict BAC based on age at first arrest. Which variable is the dependent variable? Which variable is the independent variable?
b. Draw and interpret the information contained in a scatter diagram.
c. Determine the coefficient of correlation.
d. Interpret the relationship between BAC and age using the correlation coefficient.
e. Determine the coefficient of determination. Interpret.
The solution gives the regression analysis for age and blood alcohol concentration data. Step by step procedures with interpretations are given with scatter diagram, slope, intercept, correlation, R square, coefficient of determination and regression equation