A television has an advertized life of 30 000 hours a


A television has an advertized life of 30 000 hours. A random sample of 50 sets had an average life of 28 500 hours with a sample standard deviation of 1000 hours. Using a 5 per cent significance level, what can be said about the advertisements?

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English: A television has an advertized life of 30 000 hours a
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