Question

The following data show the daily closing prices (in dollars per share) for a stock. Date...

The following data show the daily closing prices (in dollars per share) for a stock.

Date Price ($)
Nov. 3 82.74
Nov. 4 82.18
Nov. 7 83.71
Nov. 8 83.88
Nov. 9 83.50
Nov. 10 82.48
Nov. 11 84.26
Nov. 14 84.76
Nov. 15 85.09
Nov. 16 86.56
Nov. 17 86.27
Nov. 18 87.47
Nov. 21 87.60
Nov. 22 87.57
Nov. 23 88.68
Nov. 25 88.77
Nov. 28 89.74
Nov. 29 89.89
Nov. 30 89.09
Dec. 1 88.34

a. Define the independent variable Period, where Period 1 corresponds to the data for November 3 , Period 2 corresponds to the data for November 4 , and so on. Develop the estimated regression equation that can be used to predict the closing price given the value of Period (to 3 decimals).

Price = (___) + (___) period

b. At the .05 level of significance, test for any positive autocorrelation in the data.

What is the value of the Durbin-Watson statistic (to 3 decimals)?

Homework Answers

Answer #1

(a) Price = 81.781 + 0.414*Period

(b) The Durbin-Watson statistic = 1.172

0.911
r   0.954
Std. Error   0.789
n   20
k   1
Dep. Var. Price ($)
ANOVA table
Source SS   df   MS F p-value
Regression 114.0280 1   114.0280 183.22 7.09E-11
Residual 11.2024 18   0.6224
Total 125.2304 19  
Regression output confidence interval
variables coefficients std. error    t (df=18) p-value 95% lower 95% upper
Intercept 81.781
Period 0.414 0.0306 13.536 7.09E-11 0.3498 0.4784

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