Generally Electric has developed a new bulb whose design specifications call for a light out- put of 960 lumens compared to an earlier model that produced only 750 lumens. The com- pany’s data indicate that the standard deviation of light output for this type of bulb is 18.4 lumens. From a sample of 20 new bulbs, the testing committee found an average light output of 954 lumens per bulb. At a 0.05 significance level, can Generally Electric conclude that its new bulb is producing the specifi ed 960 lumen output?
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