Making Sense of Data: A Practical Guide to Exploratory Data Analysis and Data Mining

A.2 STUDENT'S T-DISTRIBUTION

Critical values of t are shown in Table A.2 for various degrees of freedom (df) The area or probability values (α) to the right of the t-value (see Figure A.2) are shown in the table. For example, with 13 degrees of freedom and 0.025 probability (α) the t-value would be 2.160.

Figure A.1. Area to the right of the z-score

Table A.1. Standard normal distribution

Table A.2. Student's t-distribution

Figure A.2. Area to the right of the t-value