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Anke has collected data from 30 similar-sized cars to investigate any correlation between the age of the car and the current market value - AQA - A-Level Maths Mechanics - Question 10 - 2021 - Paper 3
Question 10
Anke has collected data from 30 similar-sized cars to investigate any correlation between the age of the car and the current market value. She calculates the correl... show full transcript
Worked Solution & Example Answer:Anke has collected data from 30 similar-sized cars to investigate any correlation between the age of the car and the current market value - AQA - A-Level Maths Mechanics - Question 10 - 2021 - Paper 3
Step 1
Which of the following statements best describes her answer of -1.2?
Answer
A correlation coefficient (r) quantifies the degree of relationship between two variables, with the possible range being from -1 to 1. A value of -1 indicates a perfect negative correlation, while 0 indicates no correlation. Therefore, an answer of -1.2 is outside this range, which means it cannot be a valid correlation coefficient. Thus, the correct descriptor for this value is 'Definitely incorrect.'