Many Manufacturers of Light Bulbs Advertise Their 75 Watt Bulbs $\Sigma$

Essay

Many manufacturers of light bulbs advertise their 75 watt bulbs as having a life of 750 hours Suppose two electrically minded students wired up 12 bulbs so that elapsed time was recorded when the bulbs failed. The following statistics were obtained. Perform a t test, calculate the effect size index, and write a conclusion about the manufacturers' claim. $\Sigma$ X = 8820 $\Sigma$ X² = 6,487,100 N = 12