A grocery store manager is interested in determining whether or not a difference exists between the shelf life of two different brands of doughnuts.A random sample of 100 boxes of each brand was selected and the shelf life in days was determined for each box.The sample results are given below. 
Find a 98% confidence interval for 
- 
,that is,the difference in mean shelf life between Brand A and Brand B.
Definitions:
Providers
Entities or individuals that supply services or goods.
Medicare
A federal health insurance program in the United States for people aged 65 and older, and for some younger people with disabilities.
Brand Name Drugs
Medications sold under a proprietary, trademarked name, as opposed to their generic equivalents.
Medigap
Private insurance to supplement Medicare benefits for payment of the deductible, co-payment, and coinsurance.
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