Data is collected from 20 sales people in order to verify that the more contacts made with potential clients, the greater the sales volume. The MegaStat printout is shown below. (or use the excel file #contacts and sales n = 20 data only) 
Determine the 95% prediction interval for Sales when 25 contacts are made
Definitions:
Labor
The effort exerted by humans to produce goods and services in the economy.
Payroll Tax
Levies placed on both employers and employees, computed based on a fraction of the wages that employers distribute to their workforce.
Income Levels
The categories of earnings that individuals or households fall into, typically used to analyze economic and demographic data.
Tax Incidence
The study of who ultimately pays the tax or bears the burden of tax, which can differ from the entity that initially pays the tax.
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