Use Appendix F below to locate the value of t under the following conditions.

a. The sample size is 15 and the level of confidence is 95 percent.

b. The sample size is 24 and the level of confidence is 98 percent.

c. The sample size is 12 and the level of confidence is 90 percent.

Confidence Intervals 80% 90% 95% 98% 99%

Level of Significance for One-Tailed Test df 0.100 0.050 0.025 0.010 0.005

Level of Significance for Two-Tailed Test 0.20 0.10 0.05 0.02 0.01

1 3.078 6.314 12.706 31.821 63.657

2 1.886 2.920 4.303 6.965 9.925

3 1.638 2.353 3.182 4.541 5.841

4 1.533 2.132 2.776 3.747 4.604

5 1.476 2.015 2.571 3.365 4.032

6 1.440 1.943 2.447 3.143 3.707

7 1.415 1.895 2.365 2.998 3.499

8 1.397 1.860 2.306 2.896 3.355

9 1.383 1.833 2.262 2.821 3.250

10 1.372 1.812 2.228 2.764 3.169