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Define lurking variable with example.

Important Questions on Bivariate Data

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Mathematics>Statistics and Probability>Bivariate Data>Analysis of Bivariate Data
What are the types of simple correlation?
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Give an example for positive correlation?

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If cov⁡(x,y)=σxσy, then
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Mathematics>Statistics and Probability>Bivariate Data>Analysis of Bivariate Data

Give an example for no correlation

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Mathematics>Statistics and Probability>Bivariate Data>Analysis of Bivariate Data
 Explain different types of correlation.
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Coefficient of Correlation is:
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What do you mean by uncorrelated?
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If r =+1, then the correlation is called
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How do you interpret the coefficient of correlation which lies between 0 and +1?
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If the two variables do not have linear relationship between them then they have a correlation coefficient equal to
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What is the value of ‘r’ when two variables are uncorrelated?
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When the correlation coefficient is +1, state your interpretation.
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Mathematics>Statistics and Probability>Bivariate Data>Analysis of Bivariate Data
What is the value of ‘r’ when two variables are uncorrelated?
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 What are the different types of correlation?
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The height and weight of a group of persons will have _______ correlation.
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Consider the following statements :
  1. Two independent variables are always uncorrelated.
  2. The coefficient of correlation between two variables X & Y is positive. When X decreases then Y decreases.
Which of the above statements is/are correct?
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Mathematics>Statistics and Probability>Bivariate Data>Analysis of Bivariate Data
 If all the plotted points lie on a straight line falling from upper left hand corner to lower right hand corner then it is called
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The correlation coefficient of x and y is symmetric. Hence
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Which correlation coefficient value(s) indicate that a change in one variable causes a change in the other?
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Mathematics>Statistics and Probability>Bivariate Data>Analysis of Bivariate Data

Give an example for  negative correlation