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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 of660
An independent consumer group published its finding that the lifetimes of electric bulbs manufactured by BIG Corporation are approximately normally distributed with a mean of660
days and a standard deviation of124
. BIG Corporation claims that the standard deviation of its electric bulbs is less than124
. Suppose that we want to carry out ahypothesis testto see if BIG Corporation's claim is correct. State thenull hypothesisH
0
and thealternative hypothesisH
1
that we would use for this test.
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