4.43A firm wishes to estimate the mean number of operating hours of a particular type of lightbulb within 10operating hours (plus or minus) and with 95% confidence. On the basis of previous knowledge with thistype of lightbulb, the firm knows o = 30 h. How large a sample would the firm take?Ans. 35

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Economics

ns. 35

ENGR.ECONOMIC ANALYSIS

14th Edition

ISBN:9780190931919

Author:NEWNAN

Publisher:NEWNAN

Chapter1: Making Economics Decisions

Section: Chapter Questions

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Question

4.43
A firm wishes to estimate the mean number of operating hours of a particular type of lightbulb within 10
operating hours (plus or minus) and with 95% confidence. On the basis of previous knowledge with this
type of lightbulb, the firm knows o = 30 h. How large a sample would the firm take?
Ans. 35

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