Explore BrainMass

Explore BrainMass

    Hypothesis Test Regarding a Standard Deviation Irregularity

    Not what you're looking for? Search our solutions OR ask your own Custom question.

    This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!

    The mean lifetime of electric light bulbs produced by a company has in the past been 1120 hours with a standard deviation of 125 hours. A sample of 20 bulbs revealed a standard deviation in the lifetimes of 150 hours. Would you conclude that this is unusual? Explain.

    © BrainMass Inc. brainmass.com October 2, 2022, 7:42 pm ad1c9bdddf
    https://brainmass.com/statistics/hypothesis-testing/hypothesis-test-regarding-a-standard-deviation-irregularity-29992

    SOLUTION This solution is FREE courtesy of BrainMass!

    Please see the attached Word document for solution details.

    This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!

    © BrainMass Inc. brainmass.com October 2, 2022, 7:42 pm ad1c9bdddf>
    https://brainmass.com/statistics/hypothesis-testing/hypothesis-test-regarding-a-standard-deviation-irregularity-29992

    Attachments

    ADVERTISEMENT