Many manufacturers of light bulbs advertise their 100 watt bulbs as having life of 750 hours (about a month). Suppose two electrically minded students wired up 10 bulbs so that the time was recorded when they burned out. The following statistics were obtained. Perform a t test, calculate the effect size index, and write a conclusion about the manufacturers' claim. X = 7400 X2 = 5,479,600 N = 10
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\bar { X } = 740 ...
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