Question: The standard deviation for a population is 14 8

The standard deviation for a population is σ = 14.8. A sample of 25 observations selected from this population gave a mean equal to 143.72. The population is known to have a normal distribution.
a. Make a 99% confidence interval for µ.
b. Construct a 95% confidence interval for µ.
c. Determine a 90% confidence interval for µ.
d. Does the width of the confidence intervals constructed in parts a through c decrease as the confidence level decreases? Explain your answer.

View Solution:


Sale on SolutionInn
Sales0
Views83
Comments
  • CreatedAugust 25, 2015
  • Files Included
Post your question
5000