Shown below is a portion of the computer output for a regression analysis relating sales (Y in millions of dollars) and advertising expenditure (X in thousands of dollars). 
a. What has been the sample size for the above?
b. Perform a t test and determine whether or not advertising and sales are related. Let = 0.05.
c. Compute the coefficient of determination.
d. Interpret the meaning of the value of the coefficient of determination that you found in Part c. Be very specific.e. Use the estimated regression equation and predict sales for an advertising expenditure of $4,000. Give your answer in dollars.
Definitions:
Alveolar Ventilation
The process of exchanging gases between the alveoli in the lungs and the external environment, primarily involving oxygen intake and carbon dioxide expulsion.
Gas Exchange
The biological process by which organisms exchange oxygen and carbon dioxide with their environment, crucial for respiration.
Atmospheric Air
The layer of gases surrounding the Earth, primarily composed of nitrogen and oxygen, which is essential for respiration.
Asthmatic Attack
A sudden worsening of asthma symptoms caused by the tightening of muscles around the airways, leading to difficulty breathing, coughing, and wheezing.
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