Correlations LO: To be able to analyse the relationship between co-variables The know the difference between correlations and experiments To be able to.

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Presentation transcript:

Correlations LO: To be able to analyse the relationship between co-variables The know the difference between correlations and experiments To be able to analyse and interpret correlations and correlation coefficients

What is a correlation? What is a positive correlation? A negative correlation? Which is a stronger correlation: -.68, .42, or .09? What does a +1.0, 0, and a -1.0 correlation indicate?

Variables in a correlation 2 co-variables No IV and no DV Relational Numerical/Not categorical Scattergraph Alternative- NOT experimental hypothesis

Conducting Correlations

Plotting Data Plot the data onto a scattergraph. 6 rules for drawing scattergraphs… Label axis Appropriate title Appropriate graph Correctly plotted data Correct intervals on axis Line of best fit- not through zero!

The Correlation Coefficient The correlation coefficient tells us how closely data in a scattergraph falls along a straight line. The closer the value is to 1, the more aligned or related the data is. 1 or -1 tells us that the data set is perfectly aligned/related. Data sets close to zero show little to no relationship. What would you estimate to be the Correlation Coefficient? What does this mean?

Drawing a Conclusion Which hypothesis do you accept or reject? What does this mean?

Why would we ever use a correlation? Strengths Weaknesses

Complete… Can you be too laid back? HW: A correlational crossword study

Describe the Correlation What does It indicate?

Describe the Correlation What does It indicate?

Describe the Correlation

Describe the Correlation

Draw the Correlation + 1

Draw the Correlation -1

Draw the Correlation

Draw the Correlation +0.8

Draw the Correlation -0.2

Draw the Correlation +0.5