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Questions and Answers
Questions and Answers
What does the covariance measure?
What does the covariance measure?
- The direction of the linear relationship between two variables
- The strength of the linear relationship between two variables
- The causal relationship between two variables
- The pattern to the way two variables move together (correct)
In which situation does the covariance result in a large positive number?
In which situation does the covariance result in a large positive number?
- When there is no particular pattern
- When two variables move in opposite directions
- When two variables move in the same direction (correct)
- When there is a weak linear relationship
What does a covariance of 0 indicate?
What does a covariance of 0 indicate?
- A strong positive relationship
- A causal relationship
- A strong negative relationship
- A weak or no relationship (correct)
What does a large negative covariance indicate?
What does a large negative covariance indicate?
Which measure provides information about the strength, direction, and causal relationship between two variables?
Which measure provides information about the strength, direction, and causal relationship between two variables?
When is linear regression used?
When is linear regression used?
What does a positive coefficient of correlation indicate?
What does a positive coefficient of correlation indicate?
What does a negative coefficient of correlation indicate?
What does a negative coefficient of correlation indicate?
What does a coefficient of correlation equal to 0 indicate?
What does a coefficient of correlation equal to 0 indicate?
What is the y-intercept in the linear regression model?
What is the y-intercept in the linear regression model?
What does 'R squared' represent in the context of linear regression?
What does 'R squared' represent in the context of linear regression?
What is the estimated regression model used for?
What is the estimated regression model used for?
What is a key assumption of the simple linear regression model?
What is a key assumption of the simple linear regression model?
What is the purpose of Hossam's reminder at the end of the text?
What is the purpose of Hossam's reminder at the end of the text?
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