Explore BrainMass

Explore BrainMass

    Confidence interval for mean

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

    Please help with the following problems.

    1. For df = 25, determine the value of A that corresponds to each of the following probabilities:

    a.P(t > A) = 0.25
    b. P( < A) = 0.10
    c. P(-A < t < A) = .99

    2. Given the following observations in a simple random sample from a population that is approximately normally distributed, construct and interpret the 90% and 95% confidence intervals for the mea: 67 79 71 98 74 70 59 102 92 96

    © BrainMass Inc. brainmass.com June 3, 2020, 10:09 pm ad1c9bdddf
    https://brainmass.com/statistics/confidence-interval/calculations-with-confidence-interval-mean-218490

    Solution Preview

    Please see the attachments.

    Statistics
    For df = 25, determine the value of A that corresponds to each of the following probabilities:

    a. P(t > A) = 0.25
    We have P(t >0.684)=0.25 Thus A =0.684

    b. P( t< A) = 0.10
    We have P(t<-1.316)=0.10 Thus A =-1.316

    c. P(-A < t < A) = .99

    We have P(-2.787<t<2.787=0.99 Thus A = 2.787

    2. Given the following observations in a ...

    Solution Summary

    S=The solution provides step by step method for the calculation of confidence interval for mean . Formula for the calculation and Interpretations of the results are also included.

    $2.19

    ADVERTISEMENT