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In: Statistics and Probability

The​ quality-control manager at a compact fluorescent light bulb​ (CFL) factory needs to determine whether the...

The​ quality-control manager at a compact fluorescent light bulb​ (CFL) factory needs to determine whether the mean life of a large shipment of CFLs is equal to 7,501 hours. The population standard deviation is 700 hours. A random sample of 49 light bulbs indicates a sample mean life of 7,351 hours.

a. At the 0.05 level of​ significance, is there evidence that the mean life is different from 7,501 hours?

b. Compute the​ p-value and interpret its meaning.

c. Construct a 95​% confidence interval estimate of the population mean life of the light bulbs.

Solutions

Expert Solution

As we fail to Reject Ho at 5% los, we conclude that the claim is false that the there evidence that the mean life is different from 7,501 hours.

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orchestra answered 2 years ago
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