While working with the sales manager of your firm you have estimated the following model of sales volume as a function of monthly household income: 
(0.781) (0.392) Where Q is monthly sales volume,I is monthly household income in thousands,and standard errors are listed below the parameter estimates.
What is the income elasticity of your firm's product?
Definitions:
Accessor Method
In object-oriented programming, a method that is used to read data fields of an object without altering them.
Multidimensional Array
An array containing one or more arrays, allowing for the representation of data in a grid or matrix form.
One Index
Refers to data structures that start counting their elements at one instead of zero, common in certain programming languages or environments.
Subscript
A notation used to specify an element within an array or list.
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