(b) Determine the degrees of freedom and the corresponding critical value and rejection and non-rejection regions.
(c) Determine the total number of data values in these three samples.
(d) Identify the p-value and interpret the result (in other words answer whether there is a significant difference between the average price of textbooks in the three groups).
4. (25 points) Consider the Salt-Blood Pressure Data set available in Data Sets in Excel in the main menu. Here let the amount of salt (sodium) be the predictor (independent) variable and the blood pressure be the response (dependent) variable. You would like to examine the relationship between the salt intake and blood pressure.
(a) Display the scatter plot of the data.
(b) Display all the relevant regression results. Identify the slope and the y-intercept and write the regression equation.
(c) Using the regression line find the blood pressure for a person whose salt intake is at 5.5.
(d) Identify the coefficient of determination and interpret the result.