CORRELATIONS IN EXPERIMENTS

 

 

You are to work through the slide show and answer the questions as you go along.  This exercise is not a race but a learning process, so take your time and make sure that you understand each slide.

 

 

Slides

 

 

Questions

 

Answers

86

What do you understand by the term ‘Correlation’?

  

84 & 85

Sketch a graph which would show good positive correlation.

 

86 & 87

Sketch a graph which would show good negative correlation.

 

86 – 91

Sketch a scatter graph which would show zero correlation.

 
86 – 91 Sketch a scatter graph which would show a small positive correlation.

 
86 – 91 Sketch a scatter graph which would show positive correlation of nearly +1.

 
86 – 91 Sketch a scatter graph which would show negative correlation of nearly

–1.

 

86 – 91

 Sketch a scatter graph which would show a small, negative correlation.

 
86 – 91 Over what numerical range can the correlation coefficient vary?

 
86 – 91 Suppose that your analysis shows that the two variables that you are considering have a correlation between them of 0.98.  Does this result mean you can be confident that the dependent variable changes directly as a result of the independent variable?  Explain your answer.

 
86 – 91 What indicates a good correlation?

 
86 – 91 What indicates a poor correlation?  
86 – 91

Write down two variables that you think might have a high positive correlation.

 

Explain why you think that they are or are not dependent and independent variables.

  
86 – 91 Write down two variables that you think might have a weak negative correlation.

 

Explain why you think they might have a weak negative correlation.