Question

A random sample of 80 light bulbs manufactured by company A had an average
life time of 1258 hours with a standard deviation of 94 hours, while a random
sample of 60 light bulbs manufactured by company B had an average life time of
1029 hours with a standard deviation of 68 hours. Because of the high cost of
bulbs from company A, we are inclined to buy from company B unless the bulb
from company A will last over 200 hours longer on the average than those from
company B. Run a test using
 = 0.01
to determine from whom we should buy
our bulbs.

Answer 1

Answer:

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Step-by-step explanation:

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