Question: please help An independent consumer group published its finding that the lifetimes of electric bulbs manufactured by BIG Corporation are approximately normally distributed with a

please help

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 670 days and a standard deviation of 120. BIG Corporation claims that the standard deviation of its electric bulbs is less than 120. Suppose that we want to carry out a hypothesis test to see if BIG Corporation's claim is correct. State the null hypothesis Ho and the alternative hypothesis H, that we would use for this test. Ho: X P H 1 : 0 p O 5 00 020 0=0 0#0 X

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