Soap Sales Narrative
In testing the hypotheses 
vs. 
, use the following statistics: 
, 
, 
, and 
, where 
and 
represent the number of Dial Soap sales in the two samples, respectively.
-Refer to Soap Sales Narrative. Estimate with 95% confidence the difference between the two population proportions.
Definitions:
Marginal Analysis
An examination of the benefits and costs of increasing or decreasing production or consumption by one unit.
Revenue
The complete financial proceeds a company secures from conducting sales of goods and execution of services within a predetermined interval.
Costs
The total expenditure required for production, including materials, labor, and overhead expenses.
Ice Cream Truck
A mobile retail outlet that sells ice cream and related frozen desserts, typically operating in residential neighborhoods during warmer months.
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