[All Steps] A manufacturer claims to make light bulbs that last 36 months, with a standard deviation of 8 months. Exactly 50 light bulbs are tested yielding
Question: A manufacturer claims to make light bulbs that last 36 months, with a standard deviation of 8 months. Exactly 50 light bulbs are tested yielding a mean life of 32 months. At alpha = .01, should this claim be rejected?
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