A certain electronic mechanism has 2 bulbs which have been


A certain: electronic mechanism has 2 bulbs which have been observed on or off. with the following long-run relative frequencies: 

681_long-run relative frequencies.png

This table means, for example, that both bulbs were simultaneously off 30 percent of the time.

(a) Is "bulb I on" independent of "bulb 2 on"?

(b) Is "bulb 1 off" independent of "bulb 2 on"?

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Basic Statistics: A certain electronic mechanism has 2 bulbs which have been
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