Ten used cars from a rental fleet are randomly selected.Each vehicle's annual maintenance cost from the previous calendar year (y) is recorded as well as the vehicle's current mileage (x) .A simple linear regression is conducted on the data. 
What is a 98% confidence interval for the mean annual repair cost of all used vehicles with 22,500 miles.=> (Given: Sxx= 8,036,677,024 and 
= $43,627.700.)
Definitions:
Conversion Costs
The combination of direct labor and manufacturing overhead costs incurred to convert raw materials into finished products.
Direct Materials
The raw materials that are consumed in the manufacturing process and are directly allocated to the product.
Factory Overhead
All indirect costs associated with manufacturing, excluding direct materials and direct labor, such as maintenance, utilities, and equipment depreciation.
Management Process
The five basic management functions of (1) planning, (2) directing, (3) controlling, (4) improving, and (5) decision making.
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