Perform Statistical Inference for Multiple Regression $$S = 10.6075 \quad \mathrm { R } - \mathrm { Sq } = 84.48 \quad \mathrm { R } - \mathrm { Sq } ( \operatorname { adj } \mathrm { j } ) = 83.3\%$$

question 8

Multiple Choice

Perform statistical inference for multiple regression.
-What affects flat panel LCD TV sales? Flat panel LCD TV's are sold through a
Variety of outlets. Sales figures (number of units) for the popular Sony Bravia were
Obtained for last quarter from a sample of 30 different stores. Also collected were data
On the selling price and amount spent on advertising the Sony Bravia (as a percentage of
Total advertising expenditure in the previous quarter) at each store. Output is shown
Below. Which of the following statements is / are true? Dependent Variable is Sales
$\begin{array} { l r r r r } \text { Predictor } & \text { Coef } & \text { SE Coef } & \text { T } & \text { P } \\ \text { Constant } & 90.19 & 25.08 & 3.60 & 0.001 \\ \text { Price } & - 0.03055 & 0.01005 & - 3.04 & 0.005 \\ \text { Advertising } & 3.0926 & 0.3680 & 8.40 & 0.000 \end{array}$
$$S = 10.6075 \quad \mathrm { R } - \mathrm { Sq } = 84.48 \quad \mathrm { R } - \mathrm { Sq } ( \operatorname { adj } \mathrm { j } ) = 83.3\%$$
Analysis of Variance
$\begin{array} { l r r r } \text { Source } & \text { DF } & \text { SS } & \text { MS } \\ \text { Regression } & 2 & 16477.3 & 8238.7 \\ \text { Residual Error } & 27 & 3038.0 & 112.5 \\ \text { Total } & 29 & 19515.4 & \end{array}$

• A) The multiple regression model is significant overall.
• B) Selling Price is a significant independent variable in explaining Bravia sales.
• C) Amount Spent on Advertising is a significant independent variable in explaining Bravia sales.
• D) Only A and B
• E) A, B and C

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