The following is part of the results of a regression analysis involving sales (y in millions of dollars), advertising expenditures (x1 in thousands of dollars), and number of sales people (x2) for a corporation: 
a.At = 0.05 level of significance, test to determine if the model is significant. That is, determine if there exists a significant relationship between the independent variables and the dependent variable.
b.Determine the multiple coefficient of determination.
c.Determine the adjusted multiple coefficient of determination.
d.What has been the sample size for this regression analysis?
Definitions:
Volume Variance
The difference between actual and budgeted sales volumes, impacting the expected revenue or costs.
Actual Fixed Manufacturing Overhead
The real, incurred fixed costs associated with the production process, excluding variable costs, within a specific timeframe.
Standard Machine-Hours
A predetermined measure of the amount of machine time required to complete a task or produce a unit of product in an efficient, standardized environment.
Variable Overhead Rate
A rate used to allocate variable overhead costs to products or services, which fluctuates with changes in production or activity level.
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