A Grocery Store Manager Is Interested in Determining Whether or Not

question 34

Multiple Choice

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.

• A)(-0.02,1.62)
• B)(-1.12,-0.48)
• C)(0.48,1.12)
• D)(2.1,2.9)
• E)(-1.62,0.02)

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Definitions:

Currents

The flow of electric charge across a conductor or through an electrolyte, measured in amperes (A), essential in electrical and electronic circuits.

Superposition Theorem

The current in any branch of a circuit supplied by a multipower source can be determined by finding the current produced in a particular branch by each of the individual power sources acting alone.

Kirchhoff's Current Law

Kirchhoff's Current Law states that the total current entering a junction or node in an electrical circuit is equal to the total current leaving that junction, preserving the principle of charge conservation.

Algebraic Sum

The result of adding or subtracting a sequence of numbers or algebraic expressions according to mathematical rules.