Consider a confidence interval. Explain whether the width of a newly calculated confidence interval would increase decrease or stay the same as the width of the original CI as a result of each of the following changes. How are and changes effected? List all changes. What components of a CI change under the following changes?

a. sample size is doubled from 400-800
b. population size is doubled from 5 million to 10 million
c. confidence level is lowered from 95% to 90%
d. significance level is lowered from 10% to 5%

Here's a site that may help:
Statistics Tutorial: Confidence Interval (http://stattrek.com/AP-Statistics-4/Confidence-Interval.aspx?Tutorial=AP)