A psychologist is studying the effect of belly stars on Sneetches.A random sample of four Sneetches is drawn, and a test of self-image is given to each Sneetch before and after having the belly star status changed.(If the Sneetch initially had a star, it was removed; if it did not have a star, one was created on the Sneetch using the patented "Star-off/Star-on" procedure.) From the following sample data, construct a 98% confidence interval on the population mean change in self-image associated with a star status change. 
Definitions:
Job-Order Costing System
An accounting system that tracks costs individually for each job, suitable for companies producing unique products or services.
Activity-Based Costing
A costing technique that determines the cost of a product based on the activities involved in its production and the extent to which the product uses those activities.
Manufacturing Overhead
Costs related to the production process that are not directly tied to the product, such as rent for the manufacturing space, utility costs, and salaries for manufacturing management.
Traditional Costing System
A costing method that assigns manufacturing overhead costs to products based on volume metrics such as machine hours or labour hours.
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