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Use Appendix B.5 to locate the value of t under the following conditions.
The sample size is 12 and the level of confidence is 95%
The sample size is 20 and the level of confidence is 90%
The sample size is 8 and the level of confidence is 99%.

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t- value for the 
* Sample Size is 12 and level of confidence 95% 
Degrees of freedom = Sample Size - 1 = 12 -1 = 11
t -value for Degrees of freedom 11 and 95% level of confidence  is 2.201 

* Sample Size is 20 and level of confidence is 90%
Degrees of freedom = Sample Size - 1 = 20 -1 = 19
t - value for Degrees of freedom 19 and 90% level of confidence is 1.729

* Sample Size is 8 and Level of confidence is 99%
Degrees of freedom = Sample size -1 = 8 -1 = 7 
t -value for Degrees of freedom 7 and 99% level of confidence is 3.500

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