Explore BrainMass

Explore BrainMass

    Confidence Interval Multiple Choice

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

    See the attached file.

    6. 100 employees were randomly selected and the mean time on work per week 41 hours with std deviation of 5 hrs. The 95% confidence interval for the mean time for all employees on work per week was:
    (a)(40.02,41.98)
    (b)(40.18,41.82)
    (c)(1.88,8.12)
    (d)(2.75,7.25)

    For questions 7 to 9:
    Let X be a random variable with mean 200 and std deviation of 25. Find the following x values:
    7. The x value such that the area under the normal curve to the left of x is 0.6330.
    (a)208.5
    (b)241.125
    (c) 241.75
    (d) 250

    8. The x value such that the area under the normal curve to the right of x is 0.5
    (a)208.5
    (b)241.125
    (c) 241.75
    (d) 250

    9. The x value such that the area under the normal curve between 200 and x is 0.4525(x>200)
    (a)208.5
    (b)241.125
    (c) 241.75
    (d) 250.

    © BrainMass Inc. brainmass.com June 3, 2020, 9:25 pm ad1c9bdddf
    https://brainmass.com/statistics/mean/confidence-interval-multiple-choice-181305

    Attachments

    Solution Summary

    The solution determines the confidence interval in the different questions with brief explanations.

    $2.19

    ADVERTISEMENT