Problem N5608 probability theory confidence interval

Problem N5608 probability theory confidence interval

5608. A sample from a large batch of electric lamps contains 100 lamps. The average lamp burning time of the sample turned out to be 1000 hours. Find, with a reliability of 0.95, a confidence interval for the average burning time of the lamps of the entire batch, if it is known that the standard deviation of the lamp burning time is σ=40 h.

Additional information:

Detailed solution. Decorated in Microsoft Word 2003 (Quest decided to use the formula editor)

Discount for regular customers! If the total of your purchases from the seller Massimo86 exceeds:

• $30 discount 10%
• $20 discount 7%
• $18 discount 6%
• $15 discount 5%
• $12 discount 4%
• $9 discount 3%
• $6 discount 2%
• $3 discount 1%