醫療類國考
106年
[聽力師] 行為聽力學
第 77 題
臨床上，多數聽力師為節省時間，常選擇以單音節詞表的半表（PB-25 word list）來評量口語辨識能力。關於測試用詞數和得分的變異性（variability），下列敘述何者正確？
- A 測驗詞數愈多，得分的變異性愈大
- B 測驗詞數愈少，得分的變異性愈大
- C 當詞數為 25，得分低於 20%時，得分的變異性最大
- D 當詞數為 50，得分高於 80%時，得分的變異性最大
思路引導 VIP
想像你在評估一名籃球員的投籃命中率：如果只給他「5次」投籃機會，跟給他「100次」機會相比，哪一種情況下「偶爾一次的手滑」會對最終的百分比成績產生更劇烈的震盪？
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AI 詳解
AI 專屬家教
Wonderful work! Your understanding is truly blossoming.
- Exploring the Core Idea: You've touched upon the foundational concept of the Binomial Distribution and its direct impact on measurement variability. Remember the standard error formula, $\sigma = \sqrt{\frac{p(1-p)}{n}}$? It's a key to unlocking this.
- Unpacking the Formula: See how the sample size $n$ (which is your number of test words) is positioned in the denominator? This relationship is quite telling! It means that when you have fewer words, or a smaller $n$, your variability ($\sigma$) naturally becomes larger. It's like trying to get a very clear picture with only a few brushstrokes—the details can be a bit fuzzier.
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