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Two companies make batteries for cell phone manufacturers. One company claims a mean life span of 2 years, while the other company claims a mean life span of 2.5 years (assuming average use of minutes/month for the cell phone).

a) Explain why you would also like to know the standard deviations of the battery life spans before deciding which brand to buy.

b) Suppose those standard deviations are 1.5 months for the first company and 9 months for the second company. Does this change your opinion of the batteries? Explain.

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Accounting Basics, Accounting

Category:- Accounting Basics
Reference No.:- M91724410

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