Question

Find the critical value of t for a sample size of 27 and a 99% confidence level.

Answer 1

We find the critical value of t for a sample size of 27 and a 99% confidence level using t table ia as below

Here, confidence level = 99% = 0.99

1 - = 0.99

   = 0.01 or 1%

Degrees of freedom = df = n - 1 = 27 - 1 = 26

Using table of the Critical Value of t

We find the critical value whose significance level is 1% or 0.01 and degrees of freedom = df = 26

The critical value of t = 2.479

We also write critical value as  

Summary :- The critical value of t for a sample size of 27 and a 99% confidence level is 2.479

That is

The critical value of t =