Promotional Campaigns
The general manager of a chain of fast food chicken restaurants wants to determine how effective their promotional campaigns are.In these campaigns "20% off" coupons are widely distributed.These coupons are only valid for one week.To examine their effectiveness,the executive records the daily gross sales (in $1,000s)in one restaurant during the campaign and during the week after the campaign ends.The data is shown below. 
-{Promotional Campaigns Narrative} Estimate with 95% confidence the mean difference and interpret.
Definitions:
Internal Data
Information collected from within an organization for its own use, including operational data, financial records, and personnel details.
Financial Records
Documents and files that track the financial activities, status, and health of an entity, vital for analysis and regulatory compliance.
Secondary Data
Information that has been previously collected and is available for use by others, as opposed to being gathered firsthand for a specific research project.
Primary Data
Data collected directly by the researcher for the specific purpose of their study, involving first-hand evidence or new information.
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