Appliance Center sells a variety of electronic equipment and home appliances. Fo

Question

Appliance Center sells a variety of electronic equipment and home appliances. For the last 4 years, 2010 through 2013, the following quarterly sales (in $ millions) were reported.

Use the seasonal indexes you computed to determine the deseasonalized sales. Determine the linear trend equation based on the quarterly data for the 4 years. Forecast the seasonally adjusted sales for 2014. (Round your answers to 3 decimal places.)

Appliance Center sells a variety of electronic equipment and home appliances. For the last 4 years, 2010 through 2013, the following quarterly sales (in $ millions) were reported.

Explanation / Answer

Using Minitab:

Regression Analysis: y versus x

Analysis of Variance

Source      DF   Adj SS Adj MS F-Value P-Value
Regression   1   0.1611 0.1611     0.14    0.715
x          1   0.1611 0.1611     0.14    0.715
Error       14 16.2564 1.1612
Total       15 16.4175

Model Summary

      S   R-sq R-sq(adj) R-sq(pred)
1.07758 0.98%      0.00%       0.00%

Coefficients

Term        Coef SE Coef T-Value P-Value   VIF
Constant   5.202    0.565     9.21    0.000
x         0.0218   0.0584     0.37    0.715 1.00

Regression Equation

y = 5.202 + 0.0218 x

Prediction for y

Variable Setting
x           0.907

    Fit    SE Fit        95% CI              95% PI
5.22224 0.519108 (4.10886, 6.33562) (2.65687, 7.78761)

Variable Setting
x            0.76

    Fit    SE Fit        95% CI              95% PI
5.21904 0.526470 (4.08987, 6.34821) (2.64678, 7.79131)

Variable Setting
x           1.126

    Fit    SE Fit        95% CI              95% PI
5.22701 0.508211 (4.13700, 6.31701) (2.67169, 7.78232)

Variable Setting
x           1.209

    Fit    SE Fit        95% CI              95% PI
5.22881 0.504105 (4.14762, 6.31001) (2.67724, 7.78039)

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