# Complete the following

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

 Period 1 2 3 4 5 Time Series 55 57 53 49 47 Period 6 7 8 9 10 Time Series 39 41 33 28 20

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

 Day Seasonal Index Sunday 1.5 Monday .4 Tuesday .5 Wednesday .6 Thursday .7 Friday 1.4 Saturday 1.9

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?

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