Explore BrainMass

Explore BrainMass

    Statistics: The Mean Diastolic Blood Pressure

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

    Confidence interval for the population mean: Use of the standard normal

    Scenario: The mean diastolic blood pressure for a random sample of 90 people was 92 millimeters of mercury. If the standard deviation of individual blood pressure readings is known to be 12 millimeters of mercury, find a 90% confidence interval for the true mean diastolic blood pressure of all people. Then complete the questions below:

    Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place.
    a) What is the lower limit of 90% confidence interval?
    b) What is the upper limit of 90% confidence interval?

    © BrainMass Inc. brainmass.com June 3, 2020, 9:52 pm ad1c9bdddf

    Solution Preview

    m = 92, s = 12, n = 90

    Standard Error of the mean, SE = s/sqrt n = 12/sqrt 90 = 1.2649

    The ...

    Solution Summary

    This solution provides a complete and organized step by step method illustrating how to calculate the confidence interval for variance. Formulas for the calculations and an interpretation of the results are also included. Student's will find that this solution is easy to follow.