Critical T Value Chart
How to find the critical value of t.
Critical t value chart. For small sample sets use the t critical value. The t table can be used for both one-sided lower and upper and two-sided tests using the appropriate value of α. Critical tValues Area in One Tail 0005 001 0025 005 010 Degrees of Area in Two Tails Freedom 001 002 005 010 020 1 63657 31821 12706 6314 3078 2 9925 6965 4303 2920 1886.
Go along x columns and down y rows. Even more T-statistic is. 90 95 98 99 1 631 1271 3182 6366 2 292 430 697 993 3 235 318 454 584 4 213 278 375 460 5 202 257 337 403 6 194 245 314 371 7 190 237 300 350.
For a t-test with one sample the degrees of freedom is equal to n-1 which is 20-1 19 in this case. Get the corresponding value from table. It can be mathematically expressed using the following formula.
How to Use This Table This table contains critical values of the Students t distribution computed using the cumulative distribution function. T critical value one-tailed 16978. PrX.
X refers to the population observations. This has xy degrees of freedom associated with it. Critical value refers to the calculated critical value.