Explore BrainMass

Explore BrainMass

    Find 95% confidence interval for variance and standard devia

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

    You randomly select and measure the contents of 10 bottles of cough syrup. The results are listed
    4.212 4.298 4.259 4.243 4.181
    4.209 4.269 4.244 4.223 4.237

    Assume sample is taken from normally distributed population.
    Construct 95% confidence intervals for:
    (a) Confidence interval for population variance ____,_____
    Round six decimals as needed
    (b) Confidence interval for population standard deviation ____,____

    © BrainMass Inc. brainmass.com April 1, 2020, 8:42 pm ad1c9bdddf

    Solution Preview

    First, from the dataset, we could get the variance
    Find the critical values χ2R and χ2L for a 95% confidence interval when the sample size is 10.
    Because the sample size is 10, there are 9 ...

    Solution Summary

    The solution provides detailed explanation how to find out the 95% confidence interval for variance and standard deviation.