An independent consumer group published its finding that the lifetimes of electric bulbs manufactured by BIG...

 

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An independent consumer group published its finding that the lifetimes of electric bulbs manufactured by BIG Corporation are approximately normally distributed with a mean of 680 days and a standard deviation of 122. BIG Corporation claims that the standard deviation of its electric bulbs is less than 122. Suppose that we want to carry out a hypothesis test to see if BlG Corporation's claim is correct. State the null hypothesis H, and the alternative hypothesis H, that we would use for this test. H, :0 H, :0 S 3. An independent consumer group published its finding that the lifetimes of electric bulbs manufactured by BIG Corporation are approximately normally distributed with a mean of 680 days and a standard deviation of 122. BIG Corporation claims that the standard deviation of its electric bulbs is less than 122. Suppose that we want to carry out a hypothesis test to see if BlG Corporation's claim is correct. State the null hypothesis H, and the alternative hypothesis H, that we would use for this test. H, :0 H, :0 S 3.

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