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The Boston Bulb Company produces high-cost bulbs for expensive projection equipment. Johnson, the CEO, claims that...

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Statistics

The Boston Bulb Company produces high-cost bulbs for expensiveprojection equipment. Johnson, the CEO, claims that a particularbulb type has an average life of at least 600 hours.

Fourteen of these bulbs were randomly selected and tested. Thenumber of hours each bulb lasted was:

614,598,585,572,599,605,604,590,609,606,595,592,601,592

At the significance level, test Johnson's claim about the lifeof the bulbs.

Answer & Explanation Solved by verified expert
4.1 Ratings (822 Votes)
Here let X be the random variable denoting the life of thebulbHere X follows normal distribution with mean and standarddeviationThe mean is    See Answer
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