準備教Z score
突然明白了一件事
transparency比powerpoint優勝的地方是，可以在兩個不同的screen 同時放兩張不同的slides，這樣才可同步教alpha value和two tails
如用powerpoint，只會不斷把powerpoint向前向後，未能同時對照
又再次在心底不期然向兩位教授致敬了
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