Lightbulbs of a certain type are advertised as having anaverage lifetime of 750 hours
Chapter 8, Problem 20(choose chapter or problem)
Lightbulbs of a certain type are advertised as having anaverage lifetime of 750 hours. The price of these bulbs isvery favorable, so a potential customer has decided to goahead with a purchase arrangement unless it can be conclusivelydemonstrated that the true average lifetime issmaller than what is advertised. A random sample of 50bulbs was selected, the lifetime of each bulb determined, and the appropriate hypotheses were tested usingMinitab, resulting in the accompanying output.Variable N Mean StDev SE Mean Z P-Valuelifetime 50 738.44 38.20 5.40 22.14 0.016What conclusion would be appropriate for a significancelevel of .05? A significance level of .01? What significancelevel and conclusion would you recommend?
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