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Finding critical values of t-test,

Find the critical value t Superscript star for the following situations.
​a) a 99 ​% confidence interval based on df equals 18.
​b) a 98 ​% confidence interval based on df equals 51. 

Critical values for t-test using Excel. 

Finding critical values using Excel function. 

=T.INV.2T(0.01,18)  =  -2.878 and 2.878. 

98% confidence interval with 51 degrees of freedom ;  =T.INV.2T(0.012,51)  =  -2.605 and 2.605. 

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