This page features Hrs Bulb. These items can be bought at some good prices online via this site.
Company claims that the average life of a bulb is 1050 hrs. A consumer selects 40 bulbs and find the?
average life 1030 hours with a standard standard 80 hrs. prove the statement of the company. use of alpha = 0.08. Anwser is correct in saying my application from is correct. His minutes would be 1050 hours, stdev but probably 80 bulbs last a little more than average demand for 1050.
I think the question is whether, if selected other 1000 bulbs, if the average could reach 1050. Given the standard deviation, about 2.2% of the bulbs that last less than 890 hours. Now the statistics of my knowledge is weak, so I'm going with my gut here, but since the media are only 1% away and the certainty required only 92%, I guess you could say with a 92% of certainty that the means are the same.
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