In Exercise 30 we looked at the weekly average retail price (cents per gallon) of regular gas
Question:
a) What components can you see in this plot?
Heres an AR(14) model fit to these data.
Heres a time series plot of the model.
b) Does this model show that there is a (possibly unsuspected) 14-week seasonal cycle in gas prices? Explain.
c) Would you use this model to predict future gas prices? Explain.
Transcribed Image Text:
1 3.50- 825 30 90 120 Weeks Dependent variable is: Gas Price 130 total cases of which 14 are missing R squared.. 31.0% R squared (adjusted)# 30.4% 0.1587 wth 116 2114 degrees of freedom Variable Coefficient SECCoeff) t-ratio P-value Intercept 5.34942 0.2354 22.7 <0.0001 -0.463680 0.0647716 <0.0001 Lag14- ” 120 60 Weeks 30
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a There are irregular components and possible cycles b ...View the full answer
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Related Book For
Business Statistics
ISBN: 9780321925831
3rd Edition
Authors: Norean Sharpe, Richard Veaux, Paul Velleman
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