Mathematics, 30.07.2021 02:30 mariakelley15

2. A light bulb manufacturer guarantees that the mean life of a certain type of light bulb is 750 hours. A random sample of 36 light bulbs has a mean life of 735 hours. If we assume that the population standard deviation is 45 hours, is there sufficient evidence to suggest that the mean life of

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2. A light bulb manufacturer guarantees that the mean life of a certain type of light bulb is 750 ho...