Confidence intervals

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 125. BIG Corporation claims that the standard deviation of its electric bulbs is less than 125. Suppose that we want to carry out a hypothesis test to see if BIG Corporation's claim is correct. State the null hypothesis H and the alternative hypothesis H, that we would use for this test. Ho: 0 X P H: 0 P S 00 020