1) Custom Player, click and watch here (8 videos, 80 minutes):

2) Click on link to go to YouTube and watch videos (8 videos, 80 minutes):

Excel Statistics 80: Confidence Interval Sigma Known
Excel Statistics 81 Confidence Interval Sigma Known From Raw Data
Excel Statistics 82: Confidence Interval Sigma Not Known TINV function
Excel Statistics 83: Confidence Interval For Advertising TINV
Excel Statistics 84 Confidence Interval with Data Analysis Add-in  
Excel Statistics 85: Confidence Intervals for Proportions #1
Excel Statistics 86: Confidence Intervals for Proportions #2
Excel Statistics 87: Sample Size for Confidence Intervals

3) Click on link to go to YouTube Playlist (8 videos, 80 minutes):

Statistics Excel Business Class Ch08: Confidence Intervals