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Category > Programming Posted 26 May 2017 My Price 4.00

The data file beer sales contains monthly U.S. beer sales

The data file beer sales contains monthly U.S. beer sales (in millions of barrels) for the period January 1975 through December 1990.

(a) Display and interpret the plot the time series plot for these data.

(b) Now construct a time series plot that uses separate plotting symbols for the various months. Does your interpretation change from that in part (a)?

(c) Use least squares to fit a seasonal-means trend to this time series. Interpret the regression output. Save the standardized residuals from the fit for further analysis.

(d) Construct and interpret the time series plot of the standardized residuals from part (c). Be sure to use proper plotting symbols to check on seasonality in the standardized residuals.

(e) Use least squares to fit a seasonal-means plus quadratic time trend to the beer sales time series. Interpret the regression output. Save the standardized residuals from the fit for further analysis.

(f) Construct and interpret the time series plot of the standardized residuals from part (e). Again use proper plotting symbols to check for any remaining seasonality in the residuals.

Answers

Alpha Geek
(8)
Status NEW Posted 26 May 2017 02:05 PM My Price 4.00

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file 1495809950-Answer.docx preview (246 words )
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