3. (Round nal answers to two decimal places.) In 10 states, data was collected on each state's gas tax in cents per gallon and fuel use in gallons per registered vehicle. In parts (a) through (0), use the summary statistics below to nd the equation of the least-squares regression line for predicting a state's fuel use from its gas tax. Variable Mean Std. Dev. fuel use (gallons per registered vehicle) 796.5 187.9 gas tax (cents per gallon) | 27.02 l 3.77 | The correlation is r : 0.32 | (a) (5 pts.) Calculate the slope. (b) (5 pts.) Calculate the intercept. (c) (4 pts.) Write the equation for the least squares regression line. ((1) (2 pts.) Calculate r2. (e) (5 pts.) Explain what Izmeans in terms of the explanatory and response variables