Find a 98 percent confidence interval for the paired difference 
Definitions:
Wells Serviced
This term refers to the number of oil or water wells that have undergone maintenance, repair, or inspection services within a specific period.
Other Expenses
Costs that are not directly associated with the production of goods or services, such as administrative and selling expenses.
Planning Budget
A budget created for a particular level of activity, it helps in setting goals and objectives for future financial plans.
Containers Refurbished
The process of cleaning, repairing, and restoring containers to a like-new condition for reuse or resale.
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