Asked Dec 18, 2019

A random sample of 6 light bulbs had a mean life of 548 hours and a standard deviation of 29 hours.  Construct a 90% confidence interval for the mean of light bulbs of this type.


  • 532 to 564
  • 524 to 572
  • 529 to 567
  • correct answer is not given

Expert Answer

Step 1

The degrees of freedom is o...


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df = n -1 = 6-1 = 5 I| ||


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