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 0 answersPost by Kim Menefee on January 30, 2013How come the charts are never attached to the lectures? I am having trouble finding the t values without the chart.

### Estimation of Population Mean: Sigma Not Known

• The t-distribution is a bell-shaped distribution with the same mean and a larger distribution than the standard normal distribution.

• When working with the t-distribution, always remember the degrees of freedom, ν = n − 1.

• Use the t-distribution when the sample is from a normal distribution and when the population standard deviation is unknown.

### Estimation of Population Mean: Sigma Not Known

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

• Intro 0:00
• t-Distribution 0:10
• Examples: t-Distribution 0:38
• Using the t-Distribution 4:25
• Confidence Interval
• Example 1: Waiting Time 5:54
• Example 2: MPG 9:35
• Extra Example 1
• Extra Example 2