Explore BrainMass

Explore BrainMass

    Hypothesis Test Regarding a Population Mean Change

    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!

    Please show all steps.

    The mean lifetime of electric light blubs produced by a company has in the past been 1120 hours with a standard deviation of 125 hours. A sample of 8 electric bulbs recently chosen from a supply of newly produced bulbs showed a mean lifetime of 1070 hours. Test the hypothesis that the mean lifetime of the bulbs has not changed, using a level of significance of (a) 0.05 and (b) 0.01

    © BrainMass Inc. brainmass.com September 26, 2022, 6:57 pm ad1c9bdddf
    https://brainmass.com/statistics/hypothesis-testing/hypothesis-test-regarding-a-population-mean-change-29989

    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 September 26, 2022, 6:57 pm ad1c9bdddf>
    https://brainmass.com/statistics/hypothesis-testing/hypothesis-test-regarding-a-population-mean-change-29989

    Attachments

    ADVERTISEMENT