A traffic engineer wanted to study the delays in traffic movement at three traffic signal locations, as measured by the number of seconds before the first car clears the intersection. The engineer selected three locations randomly from all the signals with a similar amount of traffic and number of lanes, and similar turn and signal patterns. The engineer collected the following data on eight randomly chosen days. 
The engineer obtains a statistics book and, after investigating, decides that analysis of variance is the appropriate method for his problem. What conditions have to hold for analysis of variance to be valid?
Definitions:
Warranty Liability
The obligation a company assumes when it guarantees the condition of its product and agrees to repair or replace defective products.
FICA Taxes Payable
Liabilities owed by an employer to the federal government for Federal Insurance Contributions Act taxes, typically for Social Security and Medicare.
Current Liabilities
Obligations or debts that a company is expected to pay within one year or within the normal operating cycle of the business, typically including accounts payable and short-term loans.
Bonds Payable
A financial liability representing money a company owes to bondholders, to be repaid at a specified future date.
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