SOLUTION: Find the critical​ t-value that corresponds to 99​% confidence. Assume 19 degrees of freedom.

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Question 1155616: Find the critical​ t-value that corresponds to 99​% confidence. Assume 19 degrees of freedom.
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!

Use a t table such as this one
http://www.ttable.org/
which can be found in the back of statistics textbooks. At the bottom of the table, it shows 99% confidence interval. Highlight the entire column. Then highlight the entire row with df = 19, where df stands for "degrees of freedom"

This diagram shows what I mean


The row and column intersect at the value 2.861
This means, P( -2.861 < T < 2.861 ) = 0.99

Answer: 2.861
This value is approximate