MathematicsChapter 12: Basic Statistics
Pearson R (school Formula Idea)
r uses sums of products of deviations over a product of sqrt(sum of squares).
Learning objectives
- Define and explain pearson r (school formula idea).
- Apply pearson r (school formula idea) to a focused FBISE question.
- Check the answer for correct terms, evidence, working, and units.
Definition
r uses sums of products of deviations over a product of sqrt(sum of squares). You need not compute a long r in every paper, but you must read r=-0.88 as strong negative.
Formula
r=-0.88 as strong negative.
Where / symbols
- Pearson R (School Formula Idea)
- r uses sums of products of deviations over a product of sqrt(sum of squares). You need not compute a long r in every paper, but you must read r=-0.88 as strong negative.
Relationship
- sign = direction
Overview
Learn the idea, then use it:
Core Understanding
r uses sums of products of deviations over a product of sqrt(sum of squares). You need not compute a long r in every paper, but you must read r=-0.88 as strong negative.
Examples sign = direction · points (x,y) · r near +/-1 is strong linear · PEARSON r (SCHOOL FORMULA IDEA): r uses sums of products of deviations over a product of sqrt(sum of squares). You need not compute a long r in every pap
Exam Application
State the correct term, connect it to the chapter rule or evidence, and use a clear example or calculation.
Examples Define first · Show the rule or evidence · Check units, labels, and conclusion
WHAT — PEARSON R (SCHOOL FORMULA IDEA)
r uses sums of products of deviations over a product of sqrt(sum of squares). You need not compute a long r in every paper, but you must read r=-0.88 as strong negative.
HOW — Use the idea
Identify what is given, select this topic's rule or evidence, apply it one step at a time, and check the result.
In simple words
Do not merge pearson r (school formula idea) with a neighbouring idea that uses a different definition, rule, or method.
Key points
- sign = direction
- points (x,y)
- r near +/-1 is strong linear
Exam preparation
Exam Focus
Quick revision
Revision Zone
Review the key facts, formulas and checks before you move on.Pearson R (school Formula Idea)
Sticky Notes · Quick Revision
Core Idea
- r uses sums of products of deviations over a product of sqrt(sum of squares).
Key Points
- sign = direction
- points (x,y)
- r near +/-1 is strong linear
Simple Check
- Explain pearson r (school formula idea) in your own words and connect it to one chapter example.
How to Answer
- Define the idea, show the main rule or evidence, apply it, and check the final statement.
Common Mistake
- Do not merge pearson r (school formula idea) with a neighbouring idea that uses a different definition, rule, or method.
FBISE Exam Tip
- Use the exact term, show working where needed, and include units or labelled evidence.
60-second revision
- r uses sums of products of deviations over a product of sqrt(sum of squares).
- sign = direction
- points (x,y)
- r near +/-1 is strong linear
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