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Math Help - Confidence Intervals Help please!

  1. #1
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    Confidence Intervals Help please!

    Can someone show me how to do this problem?

    A manufacturer claims that it's light bulbs have a mean lifetime of 1550 hours with a standard deviation of 75 ours. A random sample of 50 bulbs is selected for testing. If the sample produces a mean of 1435.8 hours, is there sufficient evidence to reject the manufacturer's claim? Use alpha = .01.

    Find the 97% confidence interval of the population, "u"

    Please and thank you!
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  2. #2
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    Quote Originally Posted by mochisushi01 View Post
    Can someone show me how to do this problem?

    A manufacturer claims that it's light bulbs have a mean lifetime of 1550 hours with a standard deviation of 75 ours. A random sample of 50 bulbs is selected for testing. If the sample produces a mean of 1435.8 hours, is there sufficient evidence to reject the manufacturer's claim? Use alpha = .01.

    Find the 97% confidence interval of the population, "u"

    Please and thank you!
    There is a formula in your textbook or class notes that you need to use here. Where are you stuck in using it? Have you reviewed this material?
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