Same chapter3 marksDifficulty: Medium
The ranks of six students in two subjects give Σd2 = 30. Calculate Spearman's coefficient of rank correlation.
Correlation Analysis
2 marksDifficulty: Easy
What is correlation? State the range of Karl Pearson's coefficient of correlation and what its extreme values mean.
Original Khojo Papers practice question — not from a past board paper.
Answer
Correlation measures the degree to which two variables move together. Karl Pearson's coefficient lies between −1 and +1; a value of +1 means perfect positive correlation, −1 means perfect negative correlation and 0 means no linear correlation.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
A high correlation does not by itself establish a causal connection.
Related questions
From the same topic and chapter, at a similar level.
Same chapter3 marksDifficulty: Medium
What does a scatter diagram show, and what pattern indicates perfect positive correlation?
Correlation Analysis
Same chapter3 marksDifficulty: Medium
Distinguish between positive and negative correlation, giving one example of each.
Correlation Analysis
Same chapter3 marksDifficulty: Medium
When is Spearman's rank correlation used in preference to Karl Pearson's coefficient?
Correlation Analysis
Same subject2 marksDifficulty: Easy
If A = {1, 2} and B = {a, b}, write A × B and state the number of relations from A to B.
Relations and Functions
Same subject2 marksDifficulty: Easy
Convert 150° into radians and 3π/4 radians into degrees.
Trigonometric Functions