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--- c:ps1:2025:schedule [2025/12/02 22:36] – [Week13] hkimscil
+++ c:ps1:2025:schedule [2025/12/09 23:24] (current) – [Week15] hkimscil
@@ Line 261: / Line 261: @@
 [[:r:chi-square test]] in r
 [[:t-test]]
+[[t-test note]]
+see also two sample t-test [[:r:t-test#two sample test]] in r:t-test 문서
 </WRAP>
 <WRAP half column>
@@ Line 271: / Line 273: @@
 ===== Concepts and Ideas =====
-[[../Note on Statistical Test 2]]
+[[:anova note|t-test, a different approach]]
 </WRAP>
 <WRAP half column>
@@ Line 293: / Line 295: @@
 <WRAP half column>
-<del>[[:b:head first statistics:correlation and regression]]
+[[:b:head first statistics:correlation and regression]]
 [[:correlation]]
-[[:regression]]</del>
+[[:regression]]
+\begin{equation*} \label{eq1}
+\begin{split}
+\text{Inferential Statistics}  & = & \frac {\text{Effects}} {\text{Random Error}} \\ \\
+& = & \frac {\text{Difference between group means}}{\text{Random error, SE}} \\
+& = & \frac {\overline{X} - \overline{Y}} {\text{standard error}} \\ \\
+& = & \frac {\text{Difference between group variance}}{\text{Difference within group variance}} \\
+& = & \frac {\text{MS}_\text{between}}{\text{MS}_\text{within}} \\
+\end{split}
+\end{equation*}
 </WRAP>