AutoTrader.com would like to test if a difference exists in the age of three different types of vehicles currently on the road: trucks,cars,and vans.The following data represent the age of a random sample of trucks,cars,and vans. 
The mean square for treatments MSTR for these observations is ________.
Definitions:
Fulfillment Center
A large warehouse facility used for receiving, processing, and fulfilling customer orders quickly and efficiently.
Distribution Center
A specialized facility that serves as a strategic storage and shipping location for products, aiming to streamline product distribution to retailers or directly to consumers.
Advanced Shipping Notice
A notification of pending deliveries, typically sent electronically to a recipient detailing information about a shipment before it arrives, including contents, packaging, and carrier details.
Universal Product Code
A barcode symbol that is widely used in retail for tracking trade items in stores, containing a unique identifier for each product.
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