Question

The quality-control manager at a compact fluorescent light bulb factory need to determine whether the mean life of a large shipment of bulbs is equal to 7,500 hours. The population standard deviation is 1,000 hours. A random sample of 64 bulbs indicates a sample mean life of 7,250 hours.

1. Set the hypothesis, for matching this statement “Is there evidence that the mean life is difference from 7,500 hours?”

2. At 95% confidence, what is the estimation of population mean life of the bulbs?

3. Compute p-value.

4. Find the solution, by using level of significance = 0.05.

Answer 1