A manufacturer claims that the average lifetime of its lightbulbs is equal to 36 months. A random sample of 64 bulbs has a mean lifetime of 32 months, and the sample standard deviation is 11 months. We will be using a z-test for the population mean at x = 0.05 to check the manufacturer's claim. The null hypothesis is: Ho: μ< 36 Ho: μ > 36 Ho: μ = 36 Ho: μ = 36 20

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