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A light bulb manufacturer advertises that the average life for their light bulbs is 800 hours.

A light bulb manufacturer advertises that the average life for their light bulbs is 800 hours. A random sample of 15 of their light bulbs resulted in the following data, in hours;
990 841 953 612 727 800 686  594
835 897 943 791 750 667 723
Assume that the bulb life is normally distributed. At the 10% significance level, do the data provide evidence that the mean life for the company's light bulbs differs from the advertised mean?

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