Construct a 90% confidence interval 13

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 A random sample of 108 light bulbs had a mean life of 

x = 547 hours with a standard deviation of σ = 36 hours.   Construct a 90% confidence interval for the mean life, μ, of all light bulbs of this type.     
Jul 10th, 2015

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90 % C.I. for  μ = xbar+/- Margin of error

margin of error= zσ/sqrt(n)= 1.645*36/sqrt(108)=5.7477

90 % C.I. for  μ = (547 - 5.7,547+5.7)=( 541, 553 )

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Jul 10th, 2015

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Jul 10th, 2015
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