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Estimation of Population Mean: Sigma Not Known
VIII. Estimation of the Mean and Proportion: Lecture 4 | 19:25 min
QuickNotes™ 
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.
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