A light-bulb manufacturer advertises that the average life for
its light bulbs is 900 hours. A random sample of 15 of its light
bulbs resulted in the following lives in hours.
995 590 510 539 739 917 571 555 916 728 664 693 708 887 849
At the 10% significance level, test the claim that the sample is
from a population with a mean life of 900 hours. Use the P-value
method of testing hypotheses. Identify the null and alternative
hypotheses, test statistic, critical value(s) or P-value (or range
of P-values) as appropriate, and state the final conclusion that
addresses the original claim.