SOLUTION: This is a confidence interval question
A company manufactured a new type of lamp. A sample of 15 lamps is tested and sample mean was to be found 2500 hours and standered deviation
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Question 873675: This is a confidence interval question
A company manufactured a new type of lamp. A sample of 15 lamps is tested and sample mean was to be found 2500 hours and standered deviation is 250 hours,determine 90% confidence interval for mean life of lamp
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!
z = 1.76 at 90%, DF = 14
ME = 1.76(250/sqrt(15)) = 117.6 0r 118
CI: 2500-ME < u < 2500 + ME
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