as the standard normal distribution but it reflects the

Last updated: 11/4/2023

as the standard normal distribution but it reflects the greater variability that is expected with small samples 4 t distributions are used with small samples or when is not known Example of degrees of freedom If 10 test scores have the restriction that their mean is 80 then their sum must be 800 and we can freely assign values to the first 9 scores but the 10th score would then be determined so in this case there are 9 degrees of freedom How many degrees of freedom are there for a sample size of 34 Use the critical values of t table to find the critical value of t for a sample size of 34 when building a 90 confidence interval To find critical values of t on Excel use the following function T INV probability to left of critical value degrees of freedom