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:
Antibiotic Resistant
Refers to bacteria that have evolved the ability to survive and grow in the presence of antibiotics that were originally effective against them.
Directional Selection
A mode of natural selection where an extreme phenotype is favored over other phenotypes, causing the allele frequency to shift over time.
Bacterial Population
A bacterial population consists of a group of bacteria residing in a specific area, which can exhibit growth, mutual interactions, and adaptation to their environment.
Mutation
A change in the DNA sequence within a gene or chromosome of an organism leading to the creation of a new character or trait not found in the parental type.
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