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SOLVED:Compact Fluorescent Bulbs. Compact fluorescent bulbs are much more efficient at producing light than are ordinary incandescent bulbs. They initially cost much more, but they last far longer and use much less electricity. According to one study of these bulbs, a compact bulb that produces as much light as a 100  W incandescent bulb uses only 23  W of power. The compact bulb lasts 10,000 hours, on the average, and costs 11.00, whereas the incandescent bulb costs only 0.75, but lasts just

SOLVED:The makers of compact fluorescent light bulbs (CFL) claim the bulbs use 75 % less energy and last 10 times longer than incandescent bulbs. A 16 -watt CFL (equivalent to a 60 -watt incandescent) has a rated lifetime of 8,000 hours. To test this claim, a random sample of 50 CFLs was drawn, and the average life of a bulb was determined to be 7,960 hours. Assume the standard deviation for the life of CFL bulbs is 240 hours. a. Does this sample provide enough evidence to support the claim that

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