A company manufactures two types of bulbs, (A and B). The manager of the company tests a random sample of 50 bulbs of type A and 60 bulbs of type B and obtains the following information:
Mean Life (in hours) Standard Deviation (in hours)
Type A 1300 50
Type B 1200 60
Obtain 99% confidence interval for the difference of the average life of the two types of bulbs.
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the first time I don't think about it was a bad idea to get a little more of the time and a few minutes to 1+1=2 .
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A company manufactures two types of bulbs,
(A and B). The manager of the company tests a
random sample of 50 bulbs of type A and 60 bulbs
of type B and obtains the following information :
Mean Life
(in hours)
Standard Deviation
(in hours)
Type A 1300 50
Type B 1200 60
Obtain 99% confidence interval for the difference
of the average life of the two types of bulbs.
(Given that Z0.005 = 2.58)
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