Lessons

- Simple Random Sampling and Sampling Distribution
- Sampling Error
- Stratified Random Sampling
- Time Series and Cross Sectional Data
- Central Limit Theorem
- Standard Error of the Sample Mean
- Parameter Estimation
- Point Estimates
- Confidence Interval Estimates
- Confidence Interval for a Population mean, with a known Population Variance
- Confidence Interval for a Population mean, with an Unknown Population Variance
- Confidence Interval for a Population Mean, when the Distribution is Non-normal
- Student’s t Distribution
- How to Read Student’s t Table
- Biases in Sampling

# How to Read Student’s t Table

Student’s t distribution table has the following structure:

The row represents the upper tail area, while the column represents the degrees of freedom. The body contains the t values. Note that for one-tail distribution the values are for a and for two-tailed distribution values are for a/2.

Let’s say n = 3, the df= 3-1 = 2. If significance level a is 0.10 then a/2 = 0.05. From the table we can observe that t-value = 2.920.