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,do not reject, the manufacturer?¦s claim is true
, reject the null, the manufacturer?¦s claim is false
b. Sample size is > 30 so therefore we can use z-statistics.
(316/400 ?V 0.95)/[0.95*(1-0.95)/400]1/2 = -14.683
So, if given a significant level (?N), if z-stat < -Z?N, then reject null hypothesis and accept alternative hypothesis...
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Not really because the manufacturer claims that their television sets last at least 5 years without needing repairs but the sample collected was from consumers that owned their sets for 5 years and not beyond. In order for the results of the survey to have practical importance we would need to sample consumers that have owned their sets for 5 or more years...
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