Complete the following

·  20.19 Xr20-19 Plot the following time series to determine which of the trend models appears to fit better.

·  20.35 The following trend line and seasonal indexes were computed from 4 weeks of daily observations. Forecast the 7 values for next week. ŷ = 120 + 2.3t t = 1, 2, … , 28

17.39Refer to Exercise 17.16. Calculate the correlation between the father’s and the mother’s years of education. Is there any sign of multicollinearity? Explain.

·  Perform the Durbin–Watson test at the 5% significance level to determine whether positive first-order autocorrelation exists when d = 1.10, n = 25, and k = 3.

·  17.42 Refer to Exercise 17.20.

o  a. Calculate the correlation matrix.

o  b. Are there signs of the presence of multicollinearity? Explain.

o  c. Test the correlation between each independent variable and the dependent variable. Which independent variables are linearly related to the dependent variable?