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Summary of math. Statistics. M.6 on one page.

Statistics are materials that you've learned in junior high school before.

And will be back in grade 6.

Both in basic and additional math.

.

Today, I brought you a summary of the 6th grade statistics.

Can review before taking the exam

.

And if you like the summary content like this again

Can wait to follow. I will come down more and more. Confused > <

.

# Math # Math # Math summary # Good at math # SmartMathPro

3/26 Edited to

... Read moreเผื่อใครกำลังหา “สรุปสถิติ ม.6” แบบอ่านเร็ว ๆ ก่อนสอบ เราแนะนำให้จำเป็น “ชุด” มากกว่าท่องสูตรกระจัดกระจาย เพราะข้อสอบมักถามเป็นขั้นตอน: หาค่ากลาง → วัดการกระจาย → ตีความ/เปรียบเทียบ → อ่านแผนภาพกล่องและค่านอกเกณฑ์ 1) ค่ากลาง (ค่าเฉลี่ย/มัธยฐาน/ฐานนิยม) ใช้เมื่อไหร่ - ค่าเฉลี่ย เหมาะกับข้อมูลที่ไม่ค่อยมีค่าหลุดมาก ๆ (ไม่มี outlier หนัก ๆ) เพราะค่าเฉลี่ยโดนลากได้ - มัธยฐาน เหมาะกับข้อมูลที่มีค่านอกเกณฑ์ หรือข้อมูลเอียง ๆ (เช่น คะแนนที่มีคนได้ 0/เต็มบ่อย) - ฐานนิยม เหมาะกับข้อมูลเชิงจัดหมวด หรืออยากรู้ “ค่าที่เจอบ่อยสุด” ทริคส่วนตัวเวลาโจทย์ให้ข้อมูลเป็นตารางความถี่: หา “ค่ากลาง” ให้ชัดก่อน แล้วค่อยไปต่อเรื่องการกระจาย จะไม่หลง 2) การวัดการกระจาย (พิสัย, IQR, ความแปรปรวน, ส่วนเบี่ยงเบนมาตรฐาน) - พิสัย = ค่ามากสุด − ค่าน้อยสุด (ไว แต่ไวต่อค่านอกเกณฑ์) - IQR = Q3 − Q1 (กัน outlier ได้ดีกว่า) - ความแปรปรวน และ ส่วนเบี่ยงเบนมาตรฐาน (SD) ชอบออกแนวคำนวณและตีความ: SD มากแปลว่าข้อมูลกระจายมาก ทริค: ถ้าโจทย์ถาม “กระจายมากกว่า” ให้มอง SD/ความแปรปรวน หรือ IQR (แล้วแต่โจทย์ให้ค่าไหน) 3) ควอร์ไทล์/เปอร์เซ็นไทล์ (การวัดตำแหน่งข้อมูล) - ควอร์ไทล์ช่วยแบ่งข้อมูลเป็น 4 ส่วน: Q1, Q2(=มัธยฐาน), Q3 - เปอร์เซ็นไทล์ เช่น P90 แปลว่า 90% ของข้อมูลอยู่ “ต่ำกว่าหรือเท่ากับ” ค่านี้ เวลาเจอโจทย์จัดอันดับ/คะแนนสอบ ชอบให้ตีความ Pxx มากกว่าคำนวณยาว ๆ ดังนั้นอ่านประโยคให้ครบว่าถาม “สูงกว่า/ต่ำกว่า” 4) ค่านอกเกณฑ์ (Outlier) และแผนภาพกล่อง สิ่งที่ควรจำคู่กับแผนภาพกล่องคือ “เกณฑ์รั้ว” ของค่านอกเกณฑ์: - Lower fence = Q1 − 1.5(IQR) - Upper fence = Q3 + 1.5(IQR) ค่าที่ต่ำกว่า lower fence หรือสูงกว่า upper fence = ค่านอกเกณฑ์ ทริคตอนทำข้อสอบ: หา Q1, Q3 → คำนวณ IQR → ค่อยเช็ก outlier ทีละค่า จะเร็วและกันพลาด 5) วิธีอ่านแผนภาพกล่องให้ได้คะแนนเต็ม - เส้นกลางในกล่อง = มัธยฐาน - ความกว้างของกล่อง = IQR (ยิ่งกว้างยิ่งกระจาย) - หนวดยาวด้านไหนมาก แปลว่าข้อมูล “กระจาย/เอียง” ไปด้านนั้น - ถ้ามีจุดนอกหนวด = ค่านอกเกณฑ์ ต้องระบุให้ชัดว่าเป็น outlier สุดท้าย ถ้าอยากใช้สรุปหน้าเดียวให้คุ้ม เราทำแบบนี้: อ่านสูตรรอบแรก → ลองทำโจทย์ 2–3 ข้อที่มีทั้งค่ากลาง+SD+ควอร์ไทล์ → กลับมาทวนเฉพาะจุดที่พลาด เท่านี้ “สถิติและข้อมูล ม.6” จะเริ่มเป็นภาพรวมเดียวกัน ไม่ใช่สูตรแยก ๆ ค่ะ

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