Use the Following Information for Problems
Sales Figures (Number $1 \mathrm {~s}$

question 8

Essay

Use the following information for problems
Sales figures (number of units), selling price and amount spent on advertising (as a percentage of total advertising expenditure in the previous quarter) for the popular Sony Bravia Television were obtained for last quarter from a sample of 30 different stores. The results of a multiple regression are presented below. Dependent Variable $1 \mathrm {~s}$ Sales
$\begin{array} { l r r r r } \text { Predictor } & \text { Coef } & \text { sE Coef } & \text { T } & \text { P } \\ \text { Constant } & 90.19 & 25.08 & 3.60 & 0.001 \\ \text { Price } & = 0.03055 & 0.01005 & - 3.04 & 0.005 \\ \text { Advertising } & 3.0926 & 0.3680 & 8.40 & 0.000 \end{array}$
$$S = 10.6075 \quad R - S q = 84.4 \leqslant \quad R - S q ( a d j ) = 83.3 \div \frac { 7 } { 6 }$$
Analyaia of Variance
$\begin{array} { l r r r } \text { Source } & \text { DF } & \text { SS } & \text { MS } \\ \text { Regresgion } & 2 & 16477.3 & 8238.7 \\ \text { Residual Error } & 27 & 3038.0 & 112.5 \\ \text { Total } & 29 & 19515.4 & \end{array}$


-Use the scatterplots provided below to check assumptions for multiple regression. For each plot, list the assumption being checked, whether or not it is satisfied, and why.

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Definitions:

Platform

A digital service or infrastructure that supports the development and deployment of applications, enabling users to create, run, and manage applications without dealing with the underlying infrastructure.

Arouse Interest

To stimulate curiosity or concern about something, often used as a strategy in marketing or presentations to engage an audience.

Credibility

The quality of being trusted and believed in, often through a reputation for integrity and reliability.

Take Action

To initiate steps or measures to achieve a goal or resolve a problem.