Question

For a confidence level of 99% with a sample size of 27, find the critical t value. Question Help: D Post to forum Submit Question

Answer 1

In this case you have:

confidence interval = 99%

sample size n = 27

In order to determine the critical t value you take into account the confidence level (99%) and degree of freedom. The degrees of freedom is calculated as follow:

degrees of freedom = n - 1 = 27 - 1 = 26

With this information, confidence level and degrees of freedom you search in a t table the point in which 26 and 99% cross each other.

The associated critical t value is t = 2.48, as you can notice in the following screenshot of a part of the table.

The corresponding t value is found in the row for 26, and there is the column for 99%