Pearson R (school Formula Idea)

Pearson R (school Formula Idea)

What is it?

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.

In simple words

• 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

Important terms

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.

What you should learn

• 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.

Examples

• sign = direction
• points (x,y)
• r near +/-1 is strong linear

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.

EXAM APPLICATION

State the correct term, connect it to the chapter rule or evidence, and use a clear example or calculation.

Full school-level explanation

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.

Learn the idea, then use it:

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.

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.

Remember

• sign = direction
• points (x,y)
• r near +/-1 is strong linear

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.

Remember

• correct term
• chapter link
• clear application

Examples

• Define first
• Show the rule or evidence
• Check units, labels, and conclusion

Remember

• sign = direction
• points (x,y)
• r near +/-1 is strong linear
• keep the ideas separate
• sign = direction
• points (x,y)
• r near +/-1 is strong linear
• correct term

Deeper understanding

Go beyond memorising Pearson R (school Formula Idea). Connect the definition to reasons, relationships, exceptions, and exam wording.

Common mistakes

Exam focus

Core Idea

Key Points

Simple Check

How to Answer

Exam focus

Quick revision

• sign = direction
• points (x,y)
• r near +/-1 is strong linear
• keep the ideas separate
• 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
• 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

Do not merge pearson r (school formula idea) with a neighbouring idea that uses a different definition, rule, or method.

For long answers on Pearson R (school Formula Idea): define clearly → explain the main parts → give one example → state one exam caution.