你考完 mock,學校老師畀你嘅 predicted grade 係「U 至 5**」,你滿唔滿意?🙂
「梗係唔滿意啦!鬼唔知阿媽係女人咩?U 至5 ** 洗鬼佢 predict 呀?」🌚
呢啲時候,賭 Sir 最鍾意包拗頸:
「點解唔滿意?但係我有【99% 信心】佢個 predicted grade 係講中!咁靈都唔滿意?」
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係咪覺得有啲唔妥?但係又好似講唔出有咩唔妥?等我講你知:
其實,我哋除咗渴望一個預測要夠「準繩」之外,仲渴望佢夠「精確」。
舉個例:
例一:準繩 ✅、精確❌——預測賭 Sir 拎「U至5**」裏面其中一個 grade
例二:準繩 ❌、精確✅——預測賭 Sir 拎「95.432%」嘅得分
例三:準繩 ✅、精確✅——預測賭 Sir 拎「5**」
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套返落去 M 1嘅 concepts,我哋對 prediction 有 2 個要求:
1️⃣ 要準繩!即係 confidence level 要高
2️⃣ 要精確!即係 confidence interval 要窄
言歸正傳,若然要縮窄 confidence interval、即係想精確嘅話,第一個方法當然係「放棄準繩」,好似例二咁,亂咁 up 啲好精確嘅嘢,喺件事發生之前有咁仔細、講咁仔細,反正未發生,只要厚面皮大膽講,就可以 draw 到好多 attention,依家香港好多 KOL 都係咁搵食,歡迎自行對號入座😌
當然,如此「降低 confidence Level 以換取 narrow confidence interval」嘅策略,係一個好唔負責任嘅方法啦!咁有冇兩全其美嘅方法呢?🤤
有🤩 就係增加 sample size。用返你考 mock 嘅例子,就係要你考多好多個 mock!!!易明吖~越考得多,就越能夠反映出你嘅真正實力嘛!自然就越容易作出「準繩+精確」嘅預測。而用返你教科書啲公式,就係令分母嘅 n 上升,縮窄 confidence Interval。
不過,增加 sample size 有金錢成本 + 時間成本,所以唔能夠無止境地增加🤥 而「假設」你真係能夠無限量增加 sample size,令到 n 變成無限,你望下條公式,分母變咗無限,即係個 confidence interval 嘅 width 變埋 0,令 prediction 完全準繩,又完全精確啦!
邊個可以做到?上帝囉!或者,你都得!🥳 只要你能夠預先知道咗一件事,甚至呢件事就係由你控制,然後喺其他人面前扮預測,得咗!社會上好多人都係咁做,局中人揸住內幕料,對住公眾扮預測,咁梗係又準繩又精確啦!😍
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#M1解題王 會以題目 keyword 切入,同你極速 KO M1 題目;記住 Save 低個 post,方便你大考前攞出嚟溫🔥
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🎲賭Sir|高階數學考試專家
🎓21 項數學公開試.以一 Take 過考取完美戰績
DSE:Math+M1+M2【5**】
CE & AL:Math+A.Math+Pure+Applied【A】
IAL:C12+C34+F1+F2+F3+M1+M2+M3+S1+S2+S3+D1【A】
IGCSE:Mathematics+Further Pure Mathematics 【9】
🖥最高人氣補習網紅・貼地教數別樹一格
頻道 #杜氏數學 2016年創辦,訂閱65,000+,多條教學影片點擊100,000+;2018年獲出版社邀請,撰寫暢銷書《5**數學男人嫁得過》推廣「聰明應試」理念,並鼓勵年青人堅守自信。
🧠以心理學、高效學習融入補習教育當中
從中文大學風險管理學士畢業之後,鑽研超速學習法(Ultralearning)及教育心理學,將高效學方法先行用於自己身上,無間斷學習新知識;四年後重返校園,完成中文大學數學碩士(大數據分析)課程,期間考入門薩學會(Mensa),實證超速學習法。
🏆座右銘
好多人以為自己因為對數學無興趣,所以數學低分;事實剛好相反:因為自己數學低分,所以對數學無興趣。試諗下,若然你有歌神嘅聲線,你仲會對唱歌無興趣嗎?
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#數學 #DSE #dser #math #maths #afterschool #dsemath #examskills #mathtutor #followme #2021DSE #2022DSE #2023DSE #tutor #mathtutor #DSEfighter #tutotial
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