Mathematics, 05.03.2020 22:58 nakeytrag
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 following information obtained:
Average lifetime = 738.44 hours and a standard deviation of lifetimes equal to 38.2 hours.
Should the customer purchase the light bulbs?
(a) Make the decision on a significance level of .05?
(b) Make the decision on a significance level of .01?
Answers: 2
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