The Help Function for a Commonly Used Spreadsheet Program Gives

question 22

Essay

The help function for a commonly used spreadsheet program gives the following
definition for the regression slope it estimates: $$\frac { n \sum _ { i = 1 } ^ { n } X _ { i } Y _ { i } - \left( \sum _ { i = 1 } ^ { n } X _ { i } \right) \left( \sum _ { i = 1 } ^ { n } Y _ { i } \right) } { n \sum _ { i = 1 } ^ { n } X _ { i } ^ { 2 } - \left( \sum _ { i = 1 } ^ { n } X _ { i } \right) ^ { 2 } }$$ Prove that this formula is the same as the one given in the textbook.

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Definitions:

Consumption

The use of goods and services by households.

National Income

The total value of all goods and services produced by a country's economy over a specific period, including foreign income.

Disposable Income

The amount of money an individual or household has to spend or save after income taxes are deducted.

Real GDP

A measure of a country's economic output that accounts for changes in the price level, adjusting for inflation or deflation to reflect the true value of goods and services produced.