Edalight is a manufacturer of compact fluorescent lights (CFL) bulbs which are fluorescent bulbs designed to be

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Edalight is a manufacturer of compact fluorescent lights

(CFL) bulbs which are fluorescent bulbs designed to be more efficient than traditional incandescent bulbs. In an effort to produce a consistent product, suppose Edalight has a goal that the standard deviation for the life of its CFL bulbs is less than 500 hours. The standard deviation for the life of a random sample of 28 CFL bulbs was found to be 378 hours.

a. Using a = 0.05, perform a hypothesis test to determine if Edalight’s goal has been achieved.

b. Verify your results using PHStat.

c. Interpret the p-value obtained from the software.

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Business Statistics

ISBN: 9780133852288

2nd Edition

Authors: Robert A Donnelly, Robert Donnelly Jr

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