A large organization produces electric light bulbs in each of its two factories (A and B). It
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A large organization produces electric light bulbs in each of its two factories (A and B). It is suspected that the quality of production from factory A is better than from factory B. To test this assertion the organization collects samples from factory A and B, and measures how long each light bulb works for (in hours) before it fails. Both population standard deviations are known (σA2 = 52783 and σB2 = 61560). Conduct a two sample z-test for the population mean to test this hypothesis.
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