Lightbulbs of a certain type a

Lightbulbs of a certain type are advertised as having an average lifetime of 750 hours. The price of these bulbs is very favorable, so a potential customer has decided to go ahead with a purchase arrangement unless it can be conclusively demonstrated that the true average lifetime is smaller than what is advertised. A random sample of 50 bulbs was selected, the lifetime of each bulb determined, and the appropriate hypotheses were tested using Minitab, resulting in the accompanying output:

a. How can you tell from the output that the alternative hypothesis was not Ha: ­  750?

b. What conclusion would be appropriate for a significance level of .05? A significance level of .01? What significance level and conclusion would you recommend?

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