A) A statistics practitioner took a random sample of 50 observations from a population whose standard deviation is 25 and computed the sample mean to be 100. Estimate the population mean with 90% confidence.
b) Repeat part a using a 95% confidence level
c) Repeat part a using a 99% confidence level
d) Describe the effect on the confidence interval estimate of increasing the confidence level.© BrainMass Inc. brainmass.com June 3, 2020, 9:43 pm ad1c9bdddf
Please see attached file.
Confidence interval - mean
90% confidence level
25 std. dev.
1.677 t (df = 49)
105.928 upper ...
This solution calculates the population mean with 90%, 95% and 99% confidence level and explains the effect of increasing the confidence level percentage.